1665-8574 1665-8574 S1665-85742006000200153 Mexico 00 12 2006 00 12 2006 43 153 174

1995 2002 43-86 1997 2000 2002 1988 331-62 2001 1998 2003 1994 1999 1989 1997 147-73 1991 2003 1996 24 1 1 45-63 2001 27 4 4 687-712 1994 1993 1993 1999 1998 29 4 4 1995 1989 1988 2004 Bogotá 1997 1999 1991 1981 XV 2 2 1992 1989 17 7 7 1067-76 1987 54 215 215 513-36 1997 2003 79 79 1-14