| value | technique | year | title_of_literature<MAX120col.> | journal<MAX120col.> | vol | page | name<MAX80col.> |
| 3.3 | ICPES |
1990.02 | Personal communication, Geological Survey of Canada | | | | D.C.Gregoire |
| 2.2 | ICPES |
1990.04 | Personal communication, Geological Survey of India | | | | B.G.Rao |
| <1 | XRF |
1990.04 | Personal communication, Govern. Chem. Lab., Brisbane, Australia | | | | H.A.Olszowy, J.Hegarty, P.Smith, R.Sumner, S.Mckeo |
| 2.97 | 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 |
| 2.065 | ICPES |
1993.09 | Personal Communication, Cesky Geologicky Ustav | | | | I.Rubeska |