0188-6649 0188-6649 S0188-66492005000100201 10.21555/top.v28i1.232 Mexico 00 00 2005 00 00 2005 28 201 234 1946 1965 1976 1980 1984 1 2000 1994 1984 1963 1968 1998 1954 1966