2218-3620 2218-3620 S2218-36202018000200158 República del Ecuador 00 02 2018 00 02 2018 10 2 158 164

2009 2005 2005 Second 1990 1989 1987 2014 2005 Geographic Resources Analysis Support System 2008 2008 172 172 8 2000 7 2001 2010 2012 31 124-30 2008 6 2011 2011 8 2011 2003 2008 1990 2012 247-61 2015