1665-1324 1665-1324 S1665-13242006000100181 Mexico 00 06 2006 00 06 2006 8 15 181 188 1986 25 25 221-38 2003 2002 1972 250-5 1989 2002 1953 42-6 2002 25 25 299-345 1989 2005 XLII-XLIII 1953