1405-888X 1405-888X S1405-888X2006000200073 Mexico Mexico 00 00 2006 00 00 2006 9 2 73 77

1 1971 80 365 2 1989 321 1-7 3 1995 1 68-78 4 2001 18 395-8 5 1987 20 223-37 6 1994 65 25-8 7 1993 59 ^sA ^sA A 669 8 1994 76 626-31 9 1994 60 184-7 10 1999 65 512-6 11 2002 9 836-8 12 1966 45 493-6 13 1999 17 523-31