| value | technique | year | title_of_literature<MAX120col.> | journal<MAX120col.> | vol | page | name<MAX80col.> |
| 0.21 | ICPES |
1990.04 | Personal communication, Geological Survey of India | | | | B.G.Rao |
| 0.25 | 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 |
| <0.30 | ICPES |
1993.09 | Personal Communication, Cesky Geologicky Ustav | | | | I.Rubeska |
| 0.296 | ICPMS |
2001 | Reference Materials for Geochmical Studies: New Analytical Data by ICP-MS and Critical Discussion of Reference Values | Geostandards Newsletter | 25 | 87-125 | P. Dulski |