1990-8644 1990-8644 S1990-86442019000300014 Ecuador 00 09 2019 00 09 2019 15 68 14 21

2017 2015 2012 24 3 3 363-77 2014 1985 2014 2013 70 6 6 78-80 2012 2012 2013 2014