1405-3195 1405-3195 S1405-31952006000100039 Mexico Mexico Mexico 00 02 2006 00 02 2006 40 1 39 47

1993 95-104 1972 1990 3 29-53 1990 307-11 2001 54 640-7 1987 4 1979 24 154-6 1987 40 342-5 1998 82 803-8 1990 204 1999 117-32 1990 INEGI 1981 41-73 1998 82 497-505 2001 41 399-406 NRC 2000 232 2001 93 299-307 1997 20 101-10 2001 1 25-40 SAS. (SAS Institute Inc.) 1999 Sixth 2001 39 1 1 1-14 2002 25 97-106 2004 42 2 2 145-58