0120-100X 0120-100X S0120-100X2018000100055 10.18273/revion.v31n1-2018009 Colombia Colombia 00 06 2018 00 06 2018 31 1 55 58

[1] CENICAFE 1987 [2] 2010 77-152 [3] 2015 24 1 1 19-29 [4] 2012 78 128-31 [5] 2013 76 64-71 [6] 2016 79 12 12 3093-104 [7] 2016 123 48-57 [8] 2012 75 9 9 1603-11 [9] 2017 27 434-9 [10] 1993 56 571 [11] 1991 17 943 [12] 1993 245 2 2 259-70 [13] 2011 74 5 5 1148-53