| value | technique | year | title_of_literature<MAX120col.> | journal<MAX120col.> | vol | page | name<MAX80col.> |
| <10 | OES |
1990.04 | Personal communication, Geological Survey of India | | | | B.G.Rao |
| <2 | OES |
1990.05 | Personal Communication, U.S. Geological Survey, Lakewood | | | | J.S.Kane, J.G.Crock, P.H.Briggs and D.L.Fey |
| <2 | ICPES |
1990.05 | Personal Communication, U.S. Geological Survey, Reston | | | | J.S.Kane |
| 0.48 | ICPMS |
1993.04 | Simultaneous determination of thirty-seven trace elements in twenty-eight international rock standards by ICP-MS | Geost. Newsletter | 17 | 81-97 | CD.Garbe-Schonberg |
| 0.858 | ICPMS |
1995 | Personal communication,Toho Univ.,Japan | | | | N. Takamatsu |
| 0.45 | AA |
1996 | Determination of molybdenum in fifty three geochemical reference materials by flameless atomic absorption spectrometry | Geostamdards Newsletter | 21 | 93-96 | S.Terashima |
| 0.2 | AA |
1997 | Personal Communication,SKK,Japan | | | | |