| value | technique | year | title_of_literature<MAX120col.> | journal<MAX120col.> | vol | page | name<MAX80col.> |
|---|---|---|---|---|---|---|---|
| 1.35 | ICPMS | 1997 | Personal communication,Koberuko Co., Japan | Someya | |||
| 1.7 | HAA | 1998 | Personal communication,GSJ,Japan | S.Terashima | |||
| 1 | OES | 1999 | Personarl Communication, Institute of Geology, Estonia | T. Kiipli | |||
| 2.0 | EXRF | 2002 | Personal Communication, Southern Connecticut State Univ., USA | T. Fleming |