2631-2816 2631-2816 S2631-28162019000200034 10.32719/26312816.2019.2.2.5 Ecuador 00 10 2019 00 10 2019 2 2 34 37

2009 2018 1978 12 2 2 101-18 1999 INEC 2011 2007 2017