1405-3195 1405-3195 S1405-31952007000500527 Mexico USA 00 08 2007 00 08 2007 41 5 527 537

1994 30 1281-6 1994 32 427-37 1994 48 77-88 1997 60 35-57 1999 67 51-67 1994 15 3443-62 1991 35 257-77 1994 14 121-4 1986 7 1417-34 1999 1992 41 143-54 1994 15 3473-91 1977 1994 1994 30 1271-9 1995 100 9179-92