<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1794-6190</journal-id>
<journal-title><![CDATA[Earth Sciences Research Journal]]></journal-title>
<abbrev-journal-title><![CDATA[Earth Sci. Res. J.]]></abbrev-journal-title>
<issn>1794-6190</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1794-61902016000300004</article-id>
<article-id pub-id-type="doi">10.15446/esrj.v20n3.55440</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[An Evaluation of Recent Global Geopotential Models for Strip Area Project in Turkey]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluación de modelos geopotenciales globales recientes para un proyecto de área lineal en Turquía]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Doganalp]]></surname>
<given-names><![CDATA[Serkan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Necmettin Erbakan University Department of Geomatics Engineering ]]></institution>
<addr-line><![CDATA[Konya ]]></addr-line>
<country>Turkey</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<volume>20</volume>
<numero>3</numero>
<fpage>C1</fpage>
<lpage>C10</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1794-61902016000300004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1794-61902016000300004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1794-61902016000300004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The aim of this study is to present the evaluations based on comparisons of geoid heights that are computed from several global geopotential models (GGMs) and the GNSS/levelling data. In this application framework, differences between geoid heights obtained by GGMs and GNSS/levelling were computed. Then, the availability of geoid heights calculated by GGMs for engineering applications were investigated. The Konya-Polatli (Ankara) Express Train Project as a strip area project was chosen as the study area. The length of the project is approximately 210 km and consists of 110 benchmarks that belong to the Turkish National Triangulation Network. In this study a total of 69 GGMs were compared. In order to examine more detail, these models were classified as three groups based on CHAMP, GRACE and GOCE. Each group was evaluated separately and the results were obtained. According to results, the best five models were detected for geoid height differences (NGNSS/lev-Nggm) in terms of standard deviation. These are EIGEN-6c4, EIGEN-GRACE01s, EGM2008, EIGEN-6c3stat and EIGEN-6c2, respectively. Also, geoid heights were obtained using different parametric models. These parametric models were used in order to minimize the impact of the terms of bias, tilt etc. Generally, three, four, five and seven parametric models are used for the least-squares adjustment of the geoid height differences in the literature. Therefore, in this study the geoid heights were calculated for such different parametric models. After the geoid height values were computed from the parametric models, the best global geopotential models in terms of standard deviation were obtained as EIGEN-6c2, EIGEN-6c3stat, EGM2008, EIGEN-6c4 and EIGEN-GRACE01s, respectively. Also, geoid heights were obtained using different parametric models. These parametric models were used in order to minimize the impact of the terms of bias, tilt etc. Generally, three, four, five and seven parametric models are used for the least-squares adjustment of the geoid height differences in the literature. Therefore, in this study the geoid heights were calculated for such different parametric models. After the geoid height values were computed from the parametric models, the best global geopotential models in terms of standard deviation were obtained as EIGEN-6c2, EIGEN-6c3stat, EGM2008, EIGEN-6c4 and EIGEN-GRACE01s, respectively.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El propósito de este estudio es presentar las evaluaciones comparativas de alturas geoidales que fueron computadas a partir de varios Modelos Geopotenciales Globales (GGM, del inglés Global Geopotential Models) y la nivelación de información del Sistema Global de Navegación por Satélite. Luego se investigó la disposición para aplicaciones de ingeniería de las alturas geoidales calculadas por los modelos GGM. Se seleccionó el proyecto del Tren Expreso Konya-Polatli (Ankara) como el área de estudio por ser un terreno lineal. La longitud del proyecto es de 210 kilómetros y consiste de 110 puntos de referencia que pertenecen a la Red de Triangulación Nacional de Turquía. En este estudio se compararon 69 modelos GGM. Para un mejor examen, estos modelos se clasificaron en tres grupos basados en CHAMP (CHAllenging Minisatellite Payload), GRACE (Gravity Recovery and Climate Experiment) y GOCE (Gravity field and steady-state Ocean Circulation Explorer). Cada grupo se evaluó por separado. De acuerdo con los resultados, se detectaron los cinco modelos mejores para las diferencias de alturas geoidales (NGNSS/LEV-NGGM) en términos de desviación estándar. Estos son EIGEN-6c4, EIGEN-GRACE01s, EGM2008, EIGEN-6c3stat, y EIGEN-6c2. También se obtuvieron las alturas geoide a través de diferentes modelos paramétricos. Este mecanismo se utilizo para minimizar el impacto en términos de inclinación y declive. Generalmente, se utilizan tres, cuatro, cinco, y siete modelos paramétricos para el ajuste por mínimos cuadrados de las diferencias de alturas geoide, según la literatura. Por lo tanto, en este estudio se calcularon las alturas geoide con estos modelos paramétricos. Después de que se computaron los valores de altura geoide desde los modelos paramétricos, se obtuvieron los mejores modelos geopotenciales globales en términos de desviación estándar, estos son el EIGEN-6c2, EIGEN-6c3stat, EGM2008, EIGEN-6c4 y EIGEN-GRACE01s, respectivamente.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Global geopotential model]]></kwd>
<kwd lng="en"><![CDATA[GNSS/levelling]]></kwd>
<kwd lng="en"><![CDATA[Geoid undulations]]></kwd>
<kwd lng="en"><![CDATA[Orthometric and ellipsoidal heights]]></kwd>
<kwd lng="es"><![CDATA[Modelo geopotencial global]]></kwd>
<kwd lng="es"><![CDATA[nivelación GNSS]]></kwd>
<kwd lng="es"><![CDATA[ondulaciones geoidales]]></kwd>
<kwd lng="es"><![CDATA[alturas geoide y ortométricas]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Comparisons of Recent Global Geopotential Models with Terrestrial Gravity Field Data over New Zealand and Australia]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Amos]]></surname>
<given-names><![CDATA[M. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Featherstone]]></surname>
<given-names><![CDATA[W. E]]></given-names>
</name>
</person-group>
<source><![CDATA[Geomatics Research Australasia]]></source>
<year>2003</year>
<volume>79</volume>
<page-range>1-20</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[A procedure for modeling the differences between the gravimetric geoid model and GPS/leveling data with an example in the north part of Algeria]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[nahmed Dahoa]]></surname>
<given-names><![CDATA[S. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Kahlouchea]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Fairhead]]></surname>
<given-names><![CDATA[J.D]]></given-names>
</name>
</person-group>
<source><![CDATA[Computers &amp; Geosciences]]></source>
<year>2006</year>
<volume>32</volume>
<page-range>1733-45</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Assessment of shuttle radar topography mission elevation data based on topographic maps in Turkey]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bildirici]]></surname>
<given-names><![CDATA[I.O.]]></given-names>
</name>
<name>
<surname><![CDATA[Ustun]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Selvi]]></surname>
<given-names><![CDATA[H. Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Abbak]]></surname>
<given-names><![CDATA[R. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Bugdayci]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
</person-group>
<source><![CDATA[Cartography and Geographic Information Science]]></source>
<year>2009</year>
<volume>36</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>95-104</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[EGM_TIM_RL05: An independent geoid with centimeter accuracy purely based on the GOCE mission]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Brockmann]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Zehentner]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Höck]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Pail]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Loth]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Mayer-Gürr]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Schuh]]></surname>
<given-names><![CDATA[W. D]]></given-names>
</name>
</person-group>
<source><![CDATA[Geophysical Research Letters]]></source>
<year>2014</year>
<volume>41</volume>
<numero>22</numero>
<issue>22</issue>
<page-range>8089-99</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[The new ESA satellite-only gravity field model via the direct approach]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bruinsma]]></surname>
<given-names><![CDATA[S. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Foerste]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Abrikosov]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Marty]]></surname>
<given-names><![CDATA[J. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Rio]]></surname>
<given-names><![CDATA[M. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Mulet]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Bonvalot]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<source><![CDATA[Geophysical Research Letters]]></source>
<year>2013</year>
<volume>40</volume>
<page-range>3607-12</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bruinsma]]></surname>
<given-names><![CDATA[S. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Marty]]></surname>
<given-names><![CDATA[J. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Balmino]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Biancale]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Foerste]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Abrikosov]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Neumayer]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<source><![CDATA[GOCE Gravity Field Recovery by Means of the Direct Numerical Method]]></source>
<year>2010</year>
<conf-name><![CDATA[ Presented at the ESA Living Planet Symposium]]></conf-name>
<conf-loc>Bergen, Norway </conf-loc>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA['DEOS_CHAMP-01C_70': a model of the Earth's gravity eld computed from accelerations of the CHAMP satellite]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ditmar]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Kuznetsov]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[van Eck van der Sluijs]]></surname>
<given-names><![CDATA[A. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Schrama]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Klees]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Geodesy]]></source>
<year>2006</year>
<volume>79</volume>
<page-range>586-601</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Local geoid determination in strip area projects by using polynomials, least-squares collocation and radial basis functions]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Doganalp]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Selvi]]></surname>
<given-names><![CDATA[H. Z]]></given-names>
</name>
</person-group>
<source><![CDATA[Measurement]]></source>
<year>2015</year>
<volume>73</volume>
<page-range>429-38</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Comparison of Global Geopotential Models from the CHAMP and GRACE Missions for Regional Geoid Modelling in Turkey]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Erol]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Sideris]]></surname>
<given-names><![CDATA[M. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Celik]]></surname>
<given-names><![CDATA[R. N]]></given-names>
</name>
</person-group>
<source><![CDATA[Studia Geophysica et Geodaetica]]></source>
<year>2009</year>
<volume>53</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>419-41</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[The static gravity field model DGM-1S from GRACE and GOCE data: computation, validation and an analysis of GOCE mission's added value]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Farahani]]></surname>
<given-names><![CDATA[H. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Ditmar]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Klees]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Liu]]></surname>
<given-names><![CDATA[X.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhao]]></surname>
<given-names><![CDATA[Q.]]></given-names>
</name>
<name>
<surname><![CDATA[Guo]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Geodesy]]></source>
<year>2013</year>
<volume>87</volume>
<page-range>843-67</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Expected Contributions of Dedicated Satellite Gravity Field Missions to Regional Geoid Determination with Some Examples from Australia]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Featherstone]]></surname>
<given-names><![CDATA[W. E]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Geospatial Engineering]]></source>
<year>2002</year>
<volume>4</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>1-19</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Flechtner]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Dahle]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Neumayer]]></surname>
<given-names><![CDATA[K. H.]]></given-names>
</name>
<name>
<surname><![CDATA[König]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Förste]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The Release 04 CHAMP and GRACE EIGEN Gravity FieldModels]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Flechtner]]></surname>
<given-names><![CDATA[Frank]]></given-names>
</name>
<name>
<surname><![CDATA[Gruber]]></surname>
<given-names><![CDATA[Thomas]]></given-names>
</name>
<name>
<surname><![CDATA[Güntner]]></surname>
<given-names><![CDATA[Andreas]]></given-names>
</name>
<name>
<surname><![CDATA[Mandea]]></surname>
<given-names><![CDATA[Mioara]]></given-names>
</name>
<name>
<surname><![CDATA[Rothacher]]></surname>
<given-names><![CDATA[Markus]]></given-names>
</name>
<name>
<surname><![CDATA[Schöne]]></surname>
<given-names><![CDATA[Tilo]]></given-names>
</name>
<name>
<surname><![CDATA[Wickert]]></surname>
<given-names><![CDATA[Jens]]></given-names>
</name>
</person-group>
<source><![CDATA[System Earth via Geodetic-Geophysical Space Techniques]]></source>
<year>2010</year>
<publisher-name><![CDATA[Springer]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Földvary]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Svehla]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Gerlach]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Wermuth]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Gruber]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Rummel]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Rothacher]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Frommknecht]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Peters]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Steigenberger]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Gravity Model TUM-2Sp Based on the Energy Balance Approach and Kinematic CHAMP Orbits]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Reigber]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Lühr]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Schwintzer]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Wickert]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[Earth Observation with CHAMP, Results from Three Years in Orbit]]></source>
<year>2005</year>
<page-range>13-8</page-range><publisher-name><![CDATA[Springer]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Förste]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Bruinsma]]></surname>
<given-names><![CDATA[S. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Abrikosov]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Lemoine]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Schaller]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Götze]]></surname>
<given-names><![CDATA[H. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Ebbing]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Marty]]></surname>
<given-names><![CDATA[J. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Flechtner]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Balmino]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Biancale]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<source><![CDATA[EIGEN-6C4 The latest combined global gravity field model including GOCE data up to degree and order 2190 of GFZ Potsdam and GRGS Toulouse]]></source>
<year>2014</year>
<conf-name><![CDATA[ Presented at the 5th GOCE User Workshop]]></conf-name>
<conf-loc>Paris </conf-loc>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Förste]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Bruinsma]]></surname>
<given-names><![CDATA[S. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Flechtner]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Marty]]></surname>
<given-names><![CDATA[J. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Lemoine]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Dahle]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Abrikosov]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Neumayer]]></surname>
<given-names><![CDATA[K. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Biancale]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Barthelmes]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Balmino]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<source><![CDATA[A preliminary update of the Direct approach GOCE Processing and a new release of EIGEN-6C]]></source>
<year>2012</year>
<conf-name><![CDATA[ Presented at the AGU Fall Meeting 2012]]></conf-name>
<conf-loc>San Francisco, USA </conf-loc>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[EIGEN-6 - A new combined global gravity field model including GOCE data from the collaboration of GFZ-Potsdam and GRGS-Toulouse]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Förste]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Bruinsma]]></surname>
<given-names><![CDATA[S. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Shako]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Marty]]></surname>
<given-names><![CDATA[J. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Flechtner]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Abrikosov]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Dahle]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Lemoine]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Neumayer]]></surname>
<given-names><![CDATA[K. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Biancale]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Barthelmes]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Kőnig]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Balmino]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<source><![CDATA[Geophysical Research Abstracts]]></source>
<year>2011</year>
<volume>13</volume>
<publisher-name><![CDATA[EGU General Assembly]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[A mean global gravity field model from the combination of satellite mission and altimetry/gravimetry surface gravity data]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Förste]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Flechtner]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Schmidt]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[König]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Meyer]]></surname>
<given-names><![CDATA[U.]]></given-names>
</name>
<name>
<surname><![CDATA[Stubenvoll]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Rothacher]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Barthelmes]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Neumayer]]></surname>
<given-names><![CDATA[K. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Biancale]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Bruinsma]]></surname>
<given-names><![CDATA[S. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Lemoine]]></surname>
<given-names><![CDATA[J. M]]></given-names>
</name>
</person-group>
<source><![CDATA[Geophysical Research Abstracts]]></source>
<year>2006</year>
<volume>8</volume>
</nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Förste]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Flechtner]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Schmidt]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Meyer]]></surname>
<given-names><![CDATA[U.]]></given-names>
</name>
<name>
<surname><![CDATA[Stubenvoll]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Barthelmes]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[König]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Neumayer]]></surname>
<given-names><![CDATA[K. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Rothacher]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Reigber]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Biancale]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Bruinsma]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Lemoine]]></surname>
<given-names><![CDATA[J.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Raimondo]]></surname>
<given-names><![CDATA[J. C]]></given-names>
</name>
</person-group>
<source><![CDATA[A new high resolution global gravity field model derived from combination of GRACE and CHAMP Mission and Altimetry/ Gravimetry Surface Gravity Data]]></source>
<year>2005</year>
<month>c</month>
<conf-name><![CDATA[ Poster g004_ EGU05-A-04561.pdf presented at EGU General Assembly Vienna]]></conf-name>
<conf-loc>Austria </conf-loc>
</nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[EIGEN-GL05C - A new global combined high-resolution GRACE-based gravity field model of the GFZ-GRGS cooperation]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Förste]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Flechtner]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Schmidt]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Stubenvoll]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Rothacher]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Kusche]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Neumayer K. H.]]></surname>
<given-names><![CDATA[Biancale]]></given-names>
</name>
<name>
<surname><![CDATA[R.]]></surname>
<given-names><![CDATA[Lemoine]]></given-names>
</name>
<name>
<surname><![CDATA[J. M.]]></surname>
<given-names><![CDATA[Barthelmes]]></given-names>
</name>
<name>
<surname><![CDATA[F.]]></surname>
<given-names><![CDATA[Bruinsma]]></given-names>
</name>
<name>
<surname><![CDATA[S. L.]]></surname>
<given-names><![CDATA[König R.]]></given-names>
</name>
<name>
<surname><![CDATA[Meyer]]></surname>
<given-names><![CDATA[U]]></given-names>
</name>
</person-group>
<source><![CDATA[Geophysical Research Abstracts]]></source>
<year>2008</year>
<volume>10</volume>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[How accurately can we determine orthometric height differences from GPS and geoid data? Simulated case studies in Western Canada]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fotopoulos]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Kotsakis]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Sideris]]></surname>
<given-names><![CDATA[M. G]]></given-names>
</name>
</person-group>
<source><![CDATA[J Surv Eng]]></source>
<year>2003</year>
<volume>129</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>1-10</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gatti]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Reguzzoni]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Migliaccio]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Sanso]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<source><![CDATA[Space-wise grids of gravity gradients from GOCE data at nominal satellite altitude]]></source>
<year>2014</year>
<conf-name><![CDATA[ Presented at the 5th GOCE User Workshop]]></conf-name>
<conf-loc>Paris </conf-loc>
</nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[A CHAMP-only gravity field model from kinematic orbits using the energy integral]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gerlach]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Földvary]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Svehla]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Gruber]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Wermuth]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Sneeuw]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Frommknecht]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Oberndorfer]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Peters]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Rothacher]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Rummel]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Steigenberger]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<source><![CDATA[Geophysical Research Letters]]></source>
<year>2003</year>
<volume>30</volume>
<numero>20</numero>
<issue>20</issue>
<page-range>2037</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Proposal for Geoid Model Evaluation from GNSS-INS/Leveling Data: Case Study along a Railway Line in Greece]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gikas]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Mpimis]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Androulaki]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Surveying Engineering]]></source>
<year>2013</year>
<volume>139</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>95</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Comparisions of GGMs based on one year GOCE observations with the EGM08 and terrestrial data over the area of Sudan]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Godah]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Krynski]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[International Journal of Applied Earth Observation and Geoinformation]]></source>
<year>2013</year>
<volume>35</volume>
<page-range>128-35</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Goiginger]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Höck]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Rieser]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Mayer-Gürr]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Maier]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Krauss]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Pail]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Fecher]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Gruber]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Brockmann]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Krasbutter]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Schuh]]></surname>
<given-names><![CDATA[W. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Jaggi]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Prange]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Hausleitner]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Baur]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Kusche]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[The combined satellite-only global gravity field model GOCO02S]]></source>
<year>2011</year>
<conf-name><![CDATA[ Presented at the 2011 General Assembly of the European Geosciences Union]]></conf-name>
<conf-loc>Vienna, Austria </conf-loc>
</nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[An evaluation of recent GOCE geopotential models in Brazil]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Guimaraes]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Matos]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Blitzkow]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Geodetic Science]]></source>
<year>2012</year>
<volume>2</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>144-55</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Heiskanen]]></surname>
<given-names><![CDATA[W. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Moritz]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<source><![CDATA[Physical Geodesy]]></source>
<year>1984</year>
<publisher-loc><![CDATA[Austria ]]></publisher-loc>
<publisher-name><![CDATA[Institute of Physical Geodesy, Technical University Graz]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Assessment of EGM2008 over Germany using accurate quasigeoid heights from vertical deflections, GCG05 and GPS/ levelling. Zeitschrift fuer Geodaesie]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hirt]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<source><![CDATA[Geoinformation und Landmanagement (zfv)]]></source>
<year>2011</year>
<volume>136</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>138-49</page-range></nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hofmann-Wellenhof]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Moritz]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<source><![CDATA[Physical Geodesy]]></source>
<year>2005</year>
<publisher-name><![CDATA[Springer-Verlag Wien]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Applications of downward continuation in gravimetric geoid modeling - case studies in Western Canada]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Huang]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Véronneau]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[J. Geod]]></source>
<year>2004</year>
<volume>79</volume>
<page-range>135-45</page-range></nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ilk]]></surname>
<given-names><![CDATA[K. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Mayer-Gürr]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Feuchtinger]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[Gravity Field Recovery by Analysis of Short Arcs of CHAMP]]></source>
<year>2003</year>
<conf-name><![CDATA[ Proceedings of the 2nd Science Workshop of CHAMP]]></conf-name>
<conf-loc> </conf-loc>
</nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jäggi]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<source><![CDATA[Pseudo-Stochastic Orbit Modeling of Low Earth Satellites Using the Global Positioning System]]></source>
<year>2007</year>
<volume>73</volume>
</nlm-citation>
</ref>
<ref id="B33">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jäggi]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Beutler]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Mervart]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
</person-group>
<source><![CDATA[GRACE Gravity Field Determination using the Celestial Mechanics Approach - First Results]]></source>
<year>2008</year>
<conf-name><![CDATA[ Presented at the IAG Symposium on "Gravity, Geoid, and Earth Observation 2008"]]></conf-name>
<conf-loc>Chania, Greece </conf-loc>
</nlm-citation>
</ref>
<ref id="B34">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jäggi]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Beutler]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Meyer]]></surname>
<given-names><![CDATA[U.]]></given-names>
</name>
<name>
<surname><![CDATA[Prange]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Dach]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Mervart]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
</person-group>
<source><![CDATA[AIUB- GRACE02S -- Status of GRACE Gravity Field Recovery using the Celestial Mechanics Approach]]></source>
<year>2009</year>
<conf-name><![CDATA[ Presented at the IAG Scientific Assembly 2009]]></conf-name>
<conf-loc>Buenos Aires, Argentina </conf-loc>
</nlm-citation>
</ref>
<ref id="B35">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jäggi]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Meyer]]></surname>
<given-names><![CDATA[U.]]></given-names>
</name>
<name>
<surname><![CDATA[Beutler]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Prange]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Dach]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Mervart]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
</person-group>
<source><![CDATA[AIUB- GRACE03S: A static gravity field model computed with simultaneously solved-for time variations from 6 years of GRACE data using the Celestial Mechanics Approach]]></source>
<year>2011</year>
</nlm-citation>
</ref>
<ref id="B36">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Comparison and testing of GOCE global gravity models in Central Europe]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Janak]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Pitonak]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Geodetic Science]]></source>
<year>2011</year>
<volume>1</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>333-47</page-range></nlm-citation>
</ref>
<ref id="B37">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kaula]]></surname>
<given-names><![CDATA[W]]></given-names>
</name>
</person-group>
<source><![CDATA[Theory of Satellite Geodesy-Applications of Satellites to Geodesy]]></source>
<year>1966</year>
<publisher-loc><![CDATA[Mineola, New York ]]></publisher-loc>
<publisher-name><![CDATA[Dover Publications, Inc]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B38">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Comparison of the Qualities of Recent Global and Local Gravimetric Geoid Models in Iran]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kiamehr]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Sjöberg]]></surname>
<given-names><![CDATA[L. E]]></given-names>
</name>
</person-group>
<source><![CDATA[Stud. Geophys. Geod]]></source>
<year>2005</year>
<volume>49</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>289-304</page-range></nlm-citation>
</ref>
<ref id="B39">
<nlm-citation citation-type="">
<article-title xml:lang=""><![CDATA[Evaluation of the Earth Gravitational Model 2008 in Turkey]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[K&#305;l&#305;ço&#287;lu]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Direnç]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Simav]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Lenk]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Aktu&#287;]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Yildiz]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<source><![CDATA[External Quality Evaluation Reports of EGM08]]></source>
<year>2009</year>
<volume>4</volume>
<page-range>164-71</page-range></nlm-citation>
</ref>
<ref id="B40">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kotsakis]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Katsambalos]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Ampatzidis]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Gianniou]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[Evaluation of EGM08 in Greece using GPS and leveling heights]]></source>
<year>2008</year>
<conf-name><![CDATA[ IAG International Symposium on Gravity, Geoid and Earth Observation]]></conf-name>
<conf-loc>Chania, Greece </conf-loc>
</nlm-citation>
</ref>
<ref id="B41">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[On the adjustment of combined GPS/levelling/geoid networks]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kotsakis]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Sideris]]></surname>
<given-names><![CDATA[M. G]]></given-names>
</name>
</person-group>
<source><![CDATA[J. Geodesy]]></source>
<year>1999</year>
<volume>73</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>412-21</page-range></nlm-citation>
</ref>
<ref id="B42">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mayer-Gürr]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Eicker]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Ilk]]></surname>
<given-names><![CDATA[K. H]]></given-names>
</name>
</person-group>
<source><![CDATA[ITG-GRACE02s: a GRACE gravity field derived from short arcs of the satellite's orbit]]></source>
<year>2006</year>
<conf-name><![CDATA[ Proceedings of the First Symposium of International Gravity Field Service]]></conf-name>
<conf-loc>Istanbul </conf-loc>
</nlm-citation>
</ref>
<ref id="B43">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mayer-Gürr]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Eicker]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Ilk]]></surname>
<given-names><![CDATA[K. H]]></given-names>
</name>
</person-group>
<source><![CDATA[ITG-Grace03 Gravity Field Model]]></source>
<year>2007</year>
</nlm-citation>
</ref>
<ref id="B44">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mayer-Gürr]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Rieser]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Höck]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Brockmann]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Schuh]]></surname>
<given-names><![CDATA[W. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Krasbutter]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Kusche]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Maier]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Krauss]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Hausleitner]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Baur]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Jäggi]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Meyer]]></surname>
<given-names><![CDATA[U.]]></given-names>
</name>
<name>
<surname><![CDATA[Prange]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Pail]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Fecher]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Gruber]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
</person-group>
<source><![CDATA[The new combined satellite only model GOCO03s]]></source>
<year>2012</year>
<publisher-loc><![CDATA[Venice ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B45">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mayer-Gürr]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Zehentner]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Klinger]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Kvas]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<source><![CDATA[ITSG- Grace2014: a new GRACE gravity field release computed in Graz]]></source>
<year>2014</year>
<conf-name><![CDATA[ Presented at the GRACE Science Team Meeting (GSTM), Potsdam]]></conf-name>
<conf-loc> </conf-loc>
</nlm-citation>
</ref>
<ref id="B46">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Migliaccio]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Reguzzoni]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Gatti]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Sanso]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Herceg]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[A GOCE-only global gravity field model by the space- wise approach]]></source>
<year>2011</year>
<conf-name><![CDATA[ Proceedings of the 4th International GOCE User Workshop]]></conf-name>
<conf-loc>Munich </conf-loc>
</nlm-citation>
</ref>
<ref id="B47">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Migliaccio]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Reguzzoni]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Sanso]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Tscherning]]></surname>
<given-names><![CDATA[C. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Veicherts]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[GOCE data analysis: the space-wise approach and the first space-wise gravity field model]]></source>
<year>2010</year>
<conf-name><![CDATA[ Presented at the ESA Living Planet Symposium 2010]]></conf-name>
<conf-loc>Bergen, Norway </conf-loc>
</nlm-citation>
</ref>
<ref id="B48">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[First GOCE gravity field models derived by three different approaches]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pail]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Bruinsma]]></surname>
<given-names><![CDATA[S. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Migliaccio]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Foerste]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Goiginger]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Schuh]]></surname>
<given-names><![CDATA[W. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Hoeck]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Reguzzoni]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Brockmann]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Abrikosov]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[Veicherts]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Fecher]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Mayrhofer]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Krasbutter]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Sanso]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Tscherning]]></surname>
<given-names><![CDATA[C. C]]></given-names>
</name>
</person-group>
<source><![CDATA[Jounal of Geodesy]]></source>
<year>2011</year>
<volume>85</volume>
<page-range>819-43</page-range></nlm-citation>
</ref>
<ref id="B49">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pail]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Goiginger]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Mayrhofer]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Schuh]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Brockmann]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Krasbutter]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Hoeck]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Fecher]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
</person-group>
<source><![CDATA[GOCE gravity field model derived from orbit and gradiometry data applying the time-wise method]]></source>
<year>2010</year>
<month>a</month>
<conf-name><![CDATA[ Presented at the ESA Living Planet Symposium 2010]]></conf-name>
<conf-loc>Bergen, Norway </conf-loc>
</nlm-citation>
</ref>
<ref id="B50">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Combined satellite gravity eld model GOCO01S derived from GOCE and GRAC]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pail]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Goiginger]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
<name>
<surname><![CDATA[Schuh]]></surname>
<given-names><![CDATA[WD]]></given-names>
</name>
<name>
<surname><![CDATA[Hőck]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Brockmann]]></surname>
<given-names><![CDATA[JM]]></given-names>
</name>
<name>
<surname><![CDATA[Fecher]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Gruber]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Mayer-Gürr]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Kusche]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Jaggi]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Rieser]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
</person-group>
<source><![CDATA[Geophysical Research Letters]]></source>
<year>2010</year>
<month>b</month>
<volume>37</volume>
<page-range>L20314</page-range></nlm-citation>
</ref>
<ref id="B51">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pavlis]]></surname>
<given-names><![CDATA[NK]]></given-names>
</name>
<name>
<surname><![CDATA[Holmes]]></surname>
<given-names><![CDATA[SA]]></given-names>
</name>
<name>
<surname><![CDATA[Kenyon]]></surname>
<given-names><![CDATA[SC]]></given-names>
</name>
<name>
<surname><![CDATA[Factor]]></surname>
<given-names><![CDATA[JK]]></given-names>
</name>
</person-group>
<source><![CDATA[An Earth Gravitational Model to Degree 2160: EGM2008]]></source>
<year>2008</year>
<conf-name><![CDATA[ presented at the 2008 General Assembly of the European Geosciences Union]]></conf-name>
<conf-loc>Vienna, Austria </conf-loc>
</nlm-citation>
</ref>
<ref id="B52">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Prange]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
</person-group>
<source><![CDATA[Global Gravity Field Determination Using the GPS Measurements Made Onboard the Low Earth Orbiting Satellite CHAMP]]></source>
<year>2011</year>
<volume>81</volume>
</nlm-citation>
</ref>
<ref id="B53">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Prange]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Jaggi]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Beutler]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Dach]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Mervart]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Gravity Field Determination at the AIUB - the Celestial Mechanics Approach]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Sideris]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[Observing our Changing Earth]]></source>
<year>2009</year>
<volume>133</volume>
<page-range>353-62</page-range></nlm-citation>
</ref>
<ref id="B54">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Global Gravity Field Recovery Using Solely GPS Tracking and Accelerometer Data from CHAMP]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reigber]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Balmino]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Schwintzer]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Biancale]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Bode]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Lemoine]]></surname>
<given-names><![CDATA[JM]]></given-names>
</name>
<name>
<surname><![CDATA[König]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Loyer]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Neumayer]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
<name>
<surname><![CDATA[Marty]]></surname>
<given-names><![CDATA[JC]]></given-names>
</name>
<name>
<surname><![CDATA[Barthelmes]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Perosanz]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Zhu]]></surname>
<given-names><![CDATA[SY]]></given-names>
</name>
</person-group>
<source><![CDATA[Space Science Reviews]]></source>
<year>2003</year>
<month>a</month>
<volume>29</volume>
<page-range>55-66</page-range></nlm-citation>
</ref>
<ref id="B55">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reigber]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Jochmann]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
<name>
<surname><![CDATA[Wünsch]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Petrovic]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Schwintzer]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Barthelmes]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Neumayer]]></surname>
<given-names><![CDATA[KH]]></given-names>
</name>
<name>
<surname><![CDATA[König]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Förste]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Balmino]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Biancale]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Lemoine]]></surname>
<given-names><![CDATA[JM]]></given-names>
</name>
<name>
<surname><![CDATA[Loyer]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Perosanz]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Earth Gravity Field and Seasonal Variability from CHAMP]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Reigber]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Lühr]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Schwintzer]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Wickert]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[Earth Observation with CHAMP - Results from Three Years in Orbit]]></source>
<year>2004</year>
<month>a</month>
<page-range>25-30</page-range><publisher-loc><![CDATA[Berlin ]]></publisher-loc>
<publisher-name><![CDATA[Springer]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B56">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reigber]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Schmidt]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Flechtner]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[König]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Meyer]]></surname>
<given-names><![CDATA[U]]></given-names>
</name>
<name>
<surname><![CDATA[Neumayer]]></surname>
<given-names><![CDATA[KH]]></given-names>
</name>
<name>
<surname><![CDATA[Schwintzer]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Zhu]]></surname>
<given-names><![CDATA[SY]]></given-names>
</name>
</person-group>
<source><![CDATA[First EIGEN Gravity Field Model based on GRACE Mission Data Only]]></source>
<year>2003</year>
<month>c</month>
</nlm-citation>
</ref>
<ref id="B57">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[An Earth gravity eld model complete to degree and order 150 from GRACE: EIGEN- GRACE02S]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reigber]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Schmidt]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Flechtner]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[König]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Meyer]]></surname>
<given-names><![CDATA[U]]></given-names>
</name>
<name>
<surname><![CDATA[Neumayer]]></surname>
<given-names><![CDATA[KH]]></given-names>
</name>
<name>
<surname><![CDATA[Schwintzer]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Zhu]]></surname>
<given-names><![CDATA[SY]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Geodynamics]]></source>
<year>2005</year>
<month>a</month>
<volume>39</volume>
<page-range>1-10</page-range></nlm-citation>
</ref>
<ref id="B58">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[The CHAMP-only Earth gravity eld model EIGEN-2]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reigber]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Schwintzer]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Barthelmes]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[König]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Förste]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Balmino]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Biancale]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Lemoine]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Loyer]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Perosanz]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Fayard]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
</person-group>
<source><![CDATA[Adv. Space Res]]></source>
<year>2003</year>
<volume>31</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>1883-8</page-range></nlm-citation>
</ref>
<ref id="B59">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[The CHAMP-only Earth Gravity Field Model EIGEN-2]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reigber]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Schwintzer]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Neumayer]]></surname>
<given-names><![CDATA[KH]]></given-names>
</name>
<name>
<surname><![CDATA[Barthelmes]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[König]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Förste]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Balmino]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Biancale]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Lemoine]]></surname>
<given-names><![CDATA[JM]]></given-names>
</name>
<name>
<surname><![CDATA[Loyer]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Bruinsma]]></surname>
<given-names><![CDATA[SL]]></given-names>
</name>
<name>
<surname><![CDATA[Perosanz]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Fayard]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
</person-group>
<source><![CDATA[Advances in Space Research]]></source>
<year>2003</year>
<month>b</month>
<volume>31</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>1883-8</page-range></nlm-citation>
</ref>
<ref id="B60">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reigber]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Schwintzer]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Stubenvoll]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Schmidt]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Flechtner]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Meyer]]></surname>
<given-names><![CDATA[U]]></given-names>
</name>
<name>
<surname><![CDATA[König]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Neumayer]]></surname>
<given-names><![CDATA[KH]]></given-names>
</name>
<name>
<surname><![CDATA[Förste]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Barthelmes]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Zhu]]></surname>
<given-names><![CDATA[SY]]></given-names>
</name>
<name>
<surname><![CDATA[Balmino]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Biancale]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Lemoine]]></surname>
<given-names><![CDATA[JM]]></given-names>
</name>
<name>
<surname><![CDATA[Meixner]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
<name>
<surname><![CDATA[Raimondo]]></surname>
<given-names><![CDATA[JC]]></given-names>
</name>
</person-group>
<source><![CDATA[A High Resolution Global Gravity Field Model Combining CHAMP and GRACE Satellite Mission and Surface Data: EIGEN-CG01C]]></source>
<year>2006</year>
<publisher-name><![CDATA[Scienti c Technical Report STR06/07, GeoForschungsZentrum Potsdam]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B61">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ries]]></surname>
<given-names><![CDATA[JC]]></given-names>
</name>
<name>
<surname><![CDATA[Bettadpur]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Poole]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Richter]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
</person-group>
<source><![CDATA[Mean Background Gravity Fields for GRACE Processing]]></source>
<year>2011</year>
<conf-name><![CDATA[ presented at the GRACE Science Team Meeting]]></conf-name>
<conf-loc>Austin, TX </conf-loc>
</nlm-citation>
</ref>
<ref id="B62">
<nlm-citation citation-type="">
<article-title xml:lang=""><![CDATA[Comparing recent geopotential models in Andalusia (Southern Spain)]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rodriguez-Caderot]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Lacy]]></surname>
<given-names><![CDATA[MC]]></given-names>
</name>
<name>
<surname><![CDATA[Gil]]></surname>
<given-names><![CDATA[AJ]]></given-names>
</name>
<name>
<surname><![CDATA[Blazquez]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
</person-group>
<source><![CDATA[Stud. Geophys. Geod]]></source>
<year>2006</year>
<volume>50</volume>
<page-range>619-31</page-range></nlm-citation>
</ref>
<ref id="B63">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rudenko]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Dettmering]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Esselborn]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Schoene]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Foerste]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Lemoine]]></surname>
<given-names><![CDATA[JM]]></given-names>
</name>
<name>
<surname><![CDATA[Ablain]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Alexandre]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Neumayer]]></surname>
<given-names><![CDATA[KH]]></given-names>
</name>
</person-group>
<source><![CDATA[In uence of time variable geopotential models on precise orbits of altimetry satellites, global and regional mean sea level trends]]></source>
<year>2014</year>
<publisher-name><![CDATA[Advances in Space Research]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B64">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Dedicated gravity field missions-principles and aims]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rummel]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Balmino]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Johannessen]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Visser]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Woodworth]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Geodynamics]]></source>
<year>2002</year>
<volume>33</volume>
<page-range>3-20</page-range></nlm-citation>
</ref>
<ref id="B65">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[The ITG-Goce02 gravity eld model from GOCE orbit and gradiometer data based on the short arc approach]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Schall]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Eicker]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Kusche]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Geodesy]]></source>
<year>2014</year>
<volume>88</volume>
<page-range>403-9</page-range></nlm-citation>
</ref>
<ref id="B66">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Seeber]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Satellite Geodesy]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Gruyter]]></surname>
<given-names><![CDATA[Walter de]]></given-names>
</name>
<name>
<surname><![CDATA[Berlin Shen]]></surname>
<given-names><![CDATA[Y]]></given-names>
</name>
<name>
<surname><![CDATA[Chen]]></surname>
<given-names><![CDATA[Q]]></given-names>
</name>
<name>
<surname><![CDATA[Hsu]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[X]]></given-names>
</name>
<name>
<surname><![CDATA[Lou]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
</person-group>
<source><![CDATA[A modified short arc approach for recovering gravity eld model]]></source>
<year>2003</year>
<edition>2nd</edition>
<conf-name><![CDATA[ presented at the GRACE Science Team Meeting]]></conf-name>
<conf-loc>Austin, TX </conf-loc>
</nlm-citation>
</ref>
<ref id="B67">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[DA]]></given-names>
</name>
</person-group>
<source><![CDATA[There is no such thing as "The" EGM96 geoid: Subtle points on the use of a global geopotential model]]></source>
<year>1998</year>
<volume>8</volume>
<page-range>17-28</page-range><publisher-loc><![CDATA[Milan ]]></publisher-loc>
<publisher-name><![CDATA[IGeS Bulletin]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B68">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Improving EGM2008 by GPS and Leveling Data at Local Scale]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Soycan]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[Boletim de Ciencias Geodesicas]]></source>
<year>2014</year>
<volume>20</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>3-18</page-range></nlm-citation>
</ref>
<ref id="B69">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tapley]]></surname>
<given-names><![CDATA[BD]]></given-names>
</name>
<name>
<surname><![CDATA[Bettadpur]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Watkins]]></surname>
<given-names><![CDATA[MM]]></given-names>
</name>
<name>
<surname><![CDATA[Reigber]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<source><![CDATA[The gravity recovery and climate experiment: Mission overview and early results]]></source>
<year>2004</year>
<volume>31</volume>
<publisher-name><![CDATA[Geophys. Res. Lett]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B70">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Large scale circulation from the GRACE GGM01 Geoid]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tapley]]></surname>
<given-names><![CDATA[BD]]></given-names>
</name>
<name>
<surname><![CDATA[Chambers]]></surname>
<given-names><![CDATA[DP]]></given-names>
</name>
<name>
<surname><![CDATA[Bettadpur]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Ries]]></surname>
<given-names><![CDATA[JC]]></given-names>
</name>
</person-group>
<source><![CDATA[Geophysical Research Letters]]></source>
<year>2003</year>
<volume>30</volume>
<numero>22</numero>
<issue>22</issue>
<page-range>2163</page-range></nlm-citation>
</ref>
<ref id="B71">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tapley]]></surname>
<given-names><![CDATA[BD]]></given-names>
</name>
<name>
<surname><![CDATA[Flechtner]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Bettadpur]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Watkins]]></surname>
<given-names><![CDATA[MM]]></given-names>
</name>
</person-group>
<source><![CDATA[The status and future prospect for GRACE after the rst decade]]></source>
<year>2013</year>
</nlm-citation>
</ref>
<ref id="B72">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tapley]]></surname>
<given-names><![CDATA[BD]]></given-names>
</name>
<name>
<surname><![CDATA[Ries]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Bettadpur]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Chambers]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Cheng]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Condi]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Poole]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<source><![CDATA[The GGM03 Mean Earth Gravity Model from GRACE]]></source>
<year>2007</year>
<volume>88</volume>
<numero>52</numero>
<issue>52</issue>
<publisher-name><![CDATA[AGU]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B73">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tapley]]></surname>
<given-names><![CDATA[BD]]></given-names>
</name>
<name>
<surname><![CDATA[Ries]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Bettadpur]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Chambers]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Cheng]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Condi]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Poole]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<source><![CDATA[The GGM03 Mean Earth Gravity Model from GRACE]]></source>
<year>2007</year>
<volume>88</volume>
<numero>52</numero>
<issue>52</issue>
<publisher-name><![CDATA[AGU]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B74">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Long-range geoid testing by GPS-leveling data in Turke]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ustun]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Demirel]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Surveying Engineering]]></source>
<year>2006</year>
<volume>132</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>15-23</page-range><publisher-name><![CDATA[UTEX CSR]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B75">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Performance of three types of Stokes's Weigelt kernel in the combined solution for the geoid]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vaní&#269;ek]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Featherstone]]></surname>
<given-names><![CDATA[WE]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Geodksy]]></source>
<year>1998</year>
<volume>72</volume>
<numero>12</numero>
<issue>12</issue>
<page-range>684-97</page-range></nlm-citation>
</ref>
<ref id="B76">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Time-Variable Gravity Signal in Greenland Revealed by High-Low Satellite-to-Satellite Tracking]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Van Dam]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Jäggi]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Prange]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Tourian]]></surname>
<given-names><![CDATA[MJ]]></given-names>
</name>
<name>
<surname><![CDATA[Keller]]></surname>
<given-names><![CDATA[W]]></given-names>
</name>
<name>
<surname><![CDATA[Sneeuw]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
</person-group>
<source><![CDATA[Journal of Geophysical Research]]></source>
<year>2013</year>
<volume>118</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>3848-59</page-range></nlm-citation>
</ref>
<ref id="B77">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wenzel]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<source><![CDATA[Ultra High Degree Geopotential Models GPM98A and GPM98B to Degree 1800]]></source>
<year>1998</year>
<conf-name><![CDATA[ Proceeding of the Joint Meeting International Gravity Commission]]></conf-name>
<conf-loc>Budapest </conf-loc>
<publisher-loc><![CDATA[Helsinki ]]></publisher-loc>
<publisher-name><![CDATA[Finnish Geodetic Institute]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B78">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wermuth]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Svehla]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Földvary]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Gerlach]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Gruber]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Frommknecht]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[Peters]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Rothacher]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Rummel]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Steigenberger]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<source><![CDATA[A gravity eld model from two years of CHAMP kinematic orbits using the energy balance approach]]></source>
<year>2004</year>
<conf-name><![CDATA[ presentation at EGU 1st General Assmbly]]></conf-name>
<conf-loc>Nice, France </conf-loc>
</nlm-citation>
</ref>
<ref id="B79">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[New improved version of Generic Mapping Tools released]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wessel]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[WHF]]></given-names>
</name>
</person-group>
<source><![CDATA[EOS Trans. Amer. Geophys.]]></source>
<year>1998</year>
<volume>79</volume>
<numero>47</numero>
<issue>47</issue>
<page-range>579</page-range></nlm-citation>
</ref>
<ref id="B80">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Gravity eld contribution analysis of GOCE gravitational gradient components]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Yi]]></surname>
<given-names><![CDATA[W]]></given-names>
</name>
<name>
<surname><![CDATA[Rummel]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Gruber]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
</person-group>
<source><![CDATA[Studia Geophysica et Geodaetica]]></source>
<year>2013</year>
<volume>57</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>174-202</page-range></nlm-citation>
</ref>
<ref id="B81">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Evaluation of recent global geopotential models based on GPS/levelling data over Afyonkarahisar (Turkey)]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Yilmaz]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
<name>
<surname><![CDATA[Yilmaz]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Güllü]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Turgut]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
</person-group>
<source><![CDATA[Scientic Research and Essays]]></source>
<year>2010</year>
<volume>5</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>484-93</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
