1870-2333 1870-2333 S1870-23332006000200051 Mexico 00 12 2006 00 12 2006 2 2 51 79

1986 1979 29 4-5 4-5 693-738 1971 2 1972 31-57 1973 23 3 3 439-72 1985 3 165-229 1989 1 1 5-33 1975 1971