1996-2452 1996-2452 S1996-24522020000100099 Ecuador 00 04 2020 00 04 2020 15 1 99 110

CES 2019 2016 2013 17 3 3 273-91 2010 2010 69-90 2006 5 1 1 59-71 2008 (201 6 3 4 4 575-93 2005 1-16