2631-2654 2631-2654 S2631-26542019000200030 10.37135/unach.ns.001.04.03 Ecuador 00 11 2019 00 11 2019 2 2 30 37

2019 2017 1 1-12 1975 2010 387 1933-8 2012 2018 5 5 5 1-11 2013 2017 2019 2000 2004 1993 48 2004 2018 115 11-24 2000 19 2012