1990-8644 1990-8644 S1990-86442018000400179 Ecuador 00 09 2018 00 09 2018 14 64 179 187

2008 2010 2003 24 69 69 101-36 1999 2007 1990 1989 2017 20 1 1 27-40 2017 2002 2016 2007