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2014 146 55-62 1986 68 8-13 1984 30 323-31 1975 24 111-6 Association of Official Analytical Chemists 2012 19 34-6 2014 32 1-17 2011 1993 1997 4 1976 2 1986 11 89-100 1996 2 5-18 1987 125-62 2008 42 173-83 2017 20 307-13 2017 88 999-1005 1990 123-42 1988 549-61 1999 99 836-43 INEGI 2009 1996 1 12 12 1991 68 263-5 1997 303-5 1997 442-4 1999 2000 62 277-83 2001 68 31-9 2001 73 163-9 2013 41 382-6 1994 46 109-18 1982 13 73-7 2013 50 53-8 2013 113 103-8 1990 NRC 2007 2009 25 332-7 1994 83-109 2005 57 77-84 2004 38 43-51 2008 42 629-35 1991 156-62 SAS 2009 2 1983 2000 17 229-46 1997 3 2011 14 1-13 1996 53 55-83 1977 3 1988 144 246-51 1990 445-54 2015 3 82-6