0188-4999 0188-4999 S0188-49992005000400193 Mexico México 00 12 2005 00 12 2005 21 4 193 200

1991 30 2523-30 1997 69 27-34 2005 1993 61 229-37 1984 18 1501-7 1997 1991 1997 31 1379-82 1988 1990 1970 2 1994 28 452-8 1994 59 121-6 1980 14 161-8 2001 17 129-36 2004 79 651-7 1997 31 2407-12 1988 449-61 1959 63 1381-7 1975 1988 61 34-7 1999 365-9 2004 27 13-9 1983 12 549-52