0257-4314 0257-4314 S0257-43142022000400012 Ecuador 00 00 2022 00 00 2022 41

Council of Graduate Schools 2010 2011 2015 XXXVII 148 148 156-71 2014 Asamblea Nacional del Ecuador 2010 II 298 298 2007 32 5 5 354-7 2009 2017 10 20 20 85-104 2004 9 9 99-116 2004 1990 UNAM 2012