0188-6649 0188-6649 S0188-66492007000100053 10.21555/top.v32i1.171 Mexico 00 00 2007 00 00 2007 32 53 76

1992 2000 1927 1999 1991 1998 1992 2004 1993 XVIII 7 7 341-61 2003 1976 1996 1995 1996 LIV 18 18 251-68 1990 2003