0185-3325 0185-3325 S0185-33252006000600073 México México 00 12 2006 00 12 2006 29 6 73 80

1 1994 2 1995 3 1992 4 1975 5 1980 10 115-24 6 1973 3 88-100 7 1995 5 89-104 8 1994 17 15-23 9 1990 13 20-6 10 1997 13 165-90 11 1993 12 1998 21 1-13 13 2001 96 761-74 14 2005 15 2005 100 1611-24 16 2003 26 33-42 17 1989 9 71-82