0185-1918 0185-1918 S0185-19182008000300057 10.22201/fcpys.2448492xe.2008.204.41986 Mexico 00 12 2008 00 12 2008 50 204 57 75

1984 2001 2003 33 33 102-21 2003 2004 2000 2002 1997 1996 2006 45 45 2006 2003 1962 1997 2001 VIII 8 8 443-93 2000 1993 150 2000 196 1986 2002 1998 2000 25 25 87-94 1996 220 220 25-9 2002 1960 2003 2001 1956 1956 1998 1973 1988 2005