0124-5996 0124-5996 S0124-59962020000100187 10.18601/01245996.v22n42.08 Mexico 00 06 2020 00 06 2020 22 42 187 210

1990 14 4 4 375-93 2001 2018 20 38 38 97-127 1967 1991 2012 136 136 2018 41 115 115 119-29 2011 1994 2010 2011 1993 2018 49 193 193 171-92 1943 14 4 4 322-30 1956 1971 1 2005 1924 2014 1951 1994 2017 29 4 4 566-96 1968 1974 1980 a 1980 b 2002 2006 a 2006 c 2014 a 2014 b 2018 1997 1986 2017 76 302 302 9-54 2017 1972 2004 1 2015 2017 2011 2014 b 2014 a 2008 2016 2016 2010 2012 1 y 2 1980 1857 2017 42 4 4 1043-86 1981 1998