1990-8644 1990-8644 S1990-86442020000300099 Ecuador 00 06 2020 00 06 2020 16 74 99 111

1994 2009 7 65-92 2015 13-9 2010 2016 2003 2007 2007 2011 1995 2001 2011 31 31 2010 2015 2004 2011 3 31 31 2012