| Table of contents Rev. P+L vol.14 no.1 Caldas Jan./June 2019 Editorial | | | | · La difícil tarea de crear conocimiento Montoya Carvajal, Juan Fernando
| | | Original article | | | | · Analysis of worldwide poultry production resilience through Kuznets Curve Palacios, Francia Rengifo; Pareja, Mónica María Estrada; Velásquez, Camilo Alberto Calle; Vasco, Luis Fernando Galeano
| | | | · Removal of estrone in water and wastewater by photocatalysis: a systematic review Sánchez-Barboza, Leadina; Villagran-Sánchez, Paul Steven; Armenise-Gil, Sabino Alexander
| | | | · Stabilization of biological sludge from a wastewater treatment plant by means of Biodigester Bales Muñoz, Carlos Esteven Pulgarín; Amparo, Beatriz; Betancur, Wills
| | | | · Modeling of the hydrological performance of Green roofs in tropical Andean cities using SWMM Catimay, Jeniffer Tabares; Martínez, Laura Marely Gallo; Muñoz, Néstor Alonso Mancipe
| | | | · Cleaner production strategies-PML: a case applied to the tannery industry Monroy-Ávila, Edinson Fabián; Peña-Monroy, Cesar Arbey; Garzón-Cortes, Giovanna del Pilar
| | | | · International presence and sustainability in emerging markets: Nutresa Group towards a global leadership Gómez-Trujillo, Ana María; Rendón, Isabel Cristina Alzate
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