2011-4532 2011-4532 S2011-45322019000100096 10.17151/eleu.2019.20.6 Colombia 00 01 2019 00 01 2019 20 96 113

1989 2002 4 1 1 2007 2011 2010 2007 231-46 2010 2010 2007 2006 2010 2010 2007 2008 2002 2007 577-90