2528-7907 2528-7907 S2528-79072020000200191 10.36097/rsan.v1i39.1258 Ecuador Ecuador Ecuador 00 06 2020 00 06 2020 39 191 202

2003 2005 10(24) 93-123 2005 236 1948 Volume 1 1967 2012 2001 2004 2004 2008 1996 1999 2007 1990 2016 32(9 945-60 1984 2015 2011 2002 2008 2007 1989 2014 15 2010 2004 Villafañe y Asociados Consultores 2015