0187-5779 0187-5779 S0187-57792012000200121 Mexico Mexico Mexico Mexico Mexico 00 06 2012 00 06 2012 30 2 121 127

1982 595-623 2004 10 173-8 2002 20 81-6 1987 1989 1-7 2000 18 1-9 2000 16 75-91 International Atomic Energy Agency 2003 39-56 2004 38 625-33 2011 89 125-34 INIFAP 2005 2005 2003 8 157-85 2006 15 121-33 1998 280 112-5 2008 40 2553-62 2006 52 540-4 1993 2009 40 967-77 2008 40 290-301 1998 32 1993 43 417-33 2009 41 778-84 2009 41 671-80 1990 79-168