1026-8774 1026-8774 S1026-87742005000200261 Mexico 00 00 2005 00 00 2005 22 2 261 271

1993 32 1993 366 218 2000 80 2004 25 2 2 237-53 1995 66 97-106 2002 30 3 3 279-81 1998 48 1999 86 1717-34 2003 40 1713-24 2001 113 521-31 1994 113 2002 190