1405-3195 1405-3195 S1405-31952007000500575 Mexico Mexico Mexico 00 08 2007 00 08 2007 41 5 575 581

1975 2000 1999 82 4 4 546-55 1999 435-60 1992 416 2005 2000 93 6 6 1322-8 2006 35 6 6 1469-76 1997 490-504 1990 473-7 2001 1990 16 23-7 1988 14 1187-215 2006 99 3 3 797-802 Universidad Autónoma San Luis Potosí 2005 2004 97 6 6 1159-64 2003 32 4 4 736-41 1981 16 189-200 1992 8 125-38 2004 2003 66-70