1390-0129 1390-0129 S1390-01292019000400007 10.33333/rp.vol44n1.01 Ecuador 00 10 2019 00 10 2019 44 1 7 14

2015 BID & EPN 2016 2007 1981 1250 743-56 2010 2004 2014 EMAAP & EPN 2004 FLOW Science 2015 2015 1976 1990