0300-9041 0300-9041 S0300-90412019000100010 10.24245/gom.v87i1.2547 Mexico Mexico 00 00 2019 00 00 2019 87 1 74 78

1 2012 39 5 5 187-9 2 2010 78 3 3 160-7 3 2013 28 1 1 58-60 4 1980 134 613-6 5 2016 5 3 3 248-9