1990-8644 1990-8644 S1990-86442020000400061 Ecuador 00 08 2020 00 08 2020 16 75 61 68

2007 2019 2006 2012 2019 2014 2007 2013 2 2 2013 29 50 50 196-206 2017 2017 2010 2015