0301-7036 0301-7036 S0301-70362018000200095 10.22201/iiec.20078951e.2018.193.61283 Ecuador 00 06 2018 00 06 2018 49 193 95 118

2013 24 2011 87 3 3 1986 17 3 3 2010 16 1-2 2005 2008 6 79-107 2013 2008 46 1 1 2011 87 2008 46 2007 45 2017 2015 39 2007 34 453-75 2016 2015 1978 46 1 1 2012 30 2004 13 1 1 2017 2017 Atlanta, Estados Unidos 2007 30 1 1 2014 42 611-20 2008 50 4 2007 18 3 3 1977 2006 21 53-78 2015 54 17-196 2006 13 3 3 2015 2009 94 114-33 2014 2002 52 2007 19 4 1979 22 2 2 2013 111 1-23