1665-8574 1665-8574 S1665-85742006000100107 Mexico 00 06 2006 00 06 2006 42 107 129

1992 1837 1984 22 1992 7 1997 40 2005 29 2 2 397-412 1997 69 2002 204 1989 224 1998 16 1999 33 1999 154 1987 120 1988 1316