1405-9436 1405-9436 S1405-94362006000200297 Mexico 00 00 2006 00 00 2006 3 24 297 319

2003 1996 1995 2005 1988 2002 2005 2001 1997 1985 1999 1999 2005 2006 1994 2001 1992 1995 2001 2001 2004 66 1 1 141-92 2002