| value | technique | year | title_of_literature<MAX120col.> | journal<MAX120col.> | vol | page | name<MAX80col.> |
| 2.10 | ICPMS |
1997 | Personal communication,Koberuko Co., Japan | | | | Someya |
| 1.92 | NAA |
1998 | Personal communication,Lucas Heights Science and Technology center ,Australia | | | | H.Waldron |
| 1.79 | ICPMS |
1994 | Personal Communication,WSU GeoAnalytical Laboratory, USA | | | | C. Knaack, S. Cornelius and P. Hooper |
| 1.79 | ICPMS |
2000 | Personarl Communication,Washington State University | | | | D. Johnson |
| 2.1 | OES |
1999 | Personarl Communication, Institute of Geology, Estonia | | | | T. Kiipli |