1405-9436 1405-9436 S1405-94362007000100168 Mexico 00 00 2007 00 00 2007 3 25 168 198

2005 85 85 101-13 1999 97-124 1988 181-203 2003 139-82 2002 1999 125-51 1988 2001 87-112 INEGI 2002 INEGI 2002 2001 65-83 2000 431-71