0120-100X 0120-100X S0120-100X2018000100043 10.18273/revion.v31n1-2018007 Colombia 00 06 2018 00 06 2018 31 1 43 47

[1] 2013 24 5 5 103-12 [2] 2012 23 1 1 275-81 [3] 2005 [4] 1982 16 [5] 2012 32 2 2 8-20 [6] 2013 11(1) 10-8 [7] 2010 Guanajuato, Mexico