2011-4532 2011-4532 S2011-45322019000200051 10.17151/eleu.2019.21.4 Colombia 00 12 2019 00 12 2019 21 51 65

2014 2016 2001 1995 2001 2008 2007 2010 7 12 12 1-12 2006 2016