0300-9041 0300-9041 S0300-90412019000200125 10.24245/gom.v87i2.2668 México México 00 00 2019 00 00 2019 87 2 125 127

1 2009 127 2 2 92-6 2 2004 5 1204-10 3 1988 49 6 6 944-55 4 2010 34 5 5 1858-63 5 2009 52 1 1 40-56 6 2001 7 2 2 161-74