2007-2538 2007-2538 S2007-25382017000200239 10.15174/rv.v0i20.307 Mexico 00 12 2017 00 12 2017 10 20 239 262

1976 1977 145-54 2004 1978 2010 119-71 1990 173 173 32-8 1999 2014 189-190 189-190 76-80 1980 1977 130-4 1977 215-21 1977 53-6 1977 141-4 2009 67-79 1983 2010 1977 247-55 2010 71-118 1965 4 4 22-4 2000 2008 2010 73-191 2010 267-323 2010 2010 203-15 2010 Estados Unidos 1993 1977 135-40 1989 230-2 1980 1983 1977 222-9 2010 17-70 2007 I 2-3 2-3 41-56 2013