1870-7203 1870-7203 S1870-72032018000200166 México México 00 06 2018 00 06 2018 16 2 166 167 1 1994 64 11 11 741-4 2 1986 203 1 1 109-12 3 1987 164 2 2 327-32 4 1974 108 2 2 242-6