0121-2494 0121-2494 S0121-24942021000200055 10.17227/pys.num55-11316 Colombia 00 12 2021 00 12 2021 55 55 64

2018 49 49 47-67 1990 281-309 1997 2001 2005 2020 19-41 2000 1 1992 1999 3-25 1995 2016 2001 2007 2009 2014 2015