| value | technique | year | title_of_literature<MAX120col.> | journal<MAX120col.> | vol | page | name<MAX80col.> |
|---|---|---|---|---|---|---|---|
| <0.04 | ICPES | 1990.04 | Personal communication, Geological Survey of India | B.G.Rao | |||
| <0.30 | ICPES | 1993.09 | Personal Communication, Cesky Geologicky Ustav | I.Rubeska | |||
| 0.025 | 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 |