0185-1667 0185-1667 S0185-16671999000400121 Mexico 00 12 1999 00 12 1999 59 230 121 147

1989 23 23 1993 1975 1990 1995 1990 25 3 3 389-409 1990 8 l l 1993 32 3 3 1987 1989 1990 1989 1989 1992 Second 1981 1994 1997 1996 1985 1990 8 1 1