2631-2786 2631-2786 S2631-27862019000300043 10.35290/rcui.v6n1.2019.69 Ecuador Ecuador Ecuador Ecuador 00 04 2019 00 04 2019 6 1 43 55

2012 2010 3.a 2017 2015 23 107 107 69-80 2014 6.a 2010 2011 2015 2004 2005 16 1-25 2016 24 1 1 37-47