| value | technique | year | title_of_literature<MAX120col.> | journal<MAX120col.> | vol | page | name<MAX80col.> |
|---|
| 0.65 | AA |
1988.01 | Personal communication, BMG, Philippines | | | | E.M.Macalalad |
| <0.65 | INAA |
1989.03 | Personal communication, Musashi Institute of Technology, Japan | | | | S.Hirai and S.Suzuki |
| 0.493 | AA |
1991.01 | Personal communication, Geological Survey of Japan | | | | S.Terashima |
| <0.8 | AA |
1994 | Personal Communication, Czech Geol. surv, Czech Republic | | | | I.Rubeska |
| 0.5 | AA |
1997 | Personal Communication,SKK,Japan | | | | |
| <2 | EXRF |
2002 | Personal Communication, Southern Connecticut State Univ., USA | | | | T. Fleming |