1990-8644 1990-8644 S1990-86442020000200201 Ecuador 00 06 2020 00 06 2020 16 73 201 206

2007 101 1 1 59-68 1996 2009 10 4 4 2007 21 6 6 1184-211 1988 2010 35 2 2 153-5 2015 7 2 2 29-44 2008 26 1 1 99-115