0121-5051 0121-5051 S0121-50512017000200003 10.15446/innovar.v27n64.62364 Colombia 00 06 2017 00 06 2017 27 64 3 6 2003 2008 33 3 3 670-84 2008 33 3 3 710 -729 2008 33 3 3 685-709 2017 2016 1999 25 271-305