1405-888X 1405-888X S1405-888X2006000100030 Mexico Mexico Mexico Mexico Mexico Mexico 00 00 2006 00 00 2006 9 1 30 33

1 1993 9 265-315 2 2001 114 2891-3 3 1998 280 547-53 4 1993 73 47-59 5 2001 291 843-7 6 1998 62 5-14 7 2000 129 218-22 8 2002 94 511-8 9 2004 191-9 10 1986 56 930-3 11 1997 119 99-108 12 1998 13 1996 59 421-31 14 1992 75 101-10 15 1999 11 391-401