1996-2452 1996-2452 S1996-24522021000100138 Ecuador 00 04 2021 00 04 2021 16 1 138 146

2019 31 4 4 349-53 2012 12 1 1 16-25 2018 2009 9 35 35 4 2010 4 ed 2019 37 37 23-34 2014 2020 15 2 2 168-79 2000 2017 2018 7 2019 10 2016 2019