0122-7238 0122-7238 S0122-72382018000200047 10.19053/01227238.8538 Colombia 00 12 2018 00 12 2018 20 31 47 69

2001 2003 2012 1991 2008 6 1 1 319-46 2016 21 21 1996 1994 2013 15 21 21 335-76 2002 2013 15 21 21 229-62 2009 13 13 213-40 2000