| value | technique | year | title_of_literature<MAX120col.> | journal<MAX120col.> | vol | page | name<MAX80col.> |
| 1.2 | ICPES |
1994 | Personal communication, Universite de Bretagne Occidentale, France | | | | Jo Cotten |
| 1.05 | ICPMS |
1994 | Personal communication, National Geophysical Research Institute | | | | V.Balaram |
| 1.20 | ICPMS |
1994 | Personal communication, National Geophysial Research Instituti, India | | | | V. Balaram |
| 1.49 | ICPMS |
1998 | Personal communication,M.Watanabe,MKK,Tokyo, Japan | | | | M.Watanabe |
| 1.238 | ICPMS |
1998 | Personal communcation,Universite de Liege,Belgium | | | | I.Roelandts |
| 1.31 | ICPMS |
1994 | Personal Communication,WSU GeoAnalytical Laboratory, USA | | | | C. Knaack, S. Cornelius and P. Hooper |
| 1.31 | ICPMS |
2000 | Personarl Communication,Washington State University | | | | D. Johnson |
| 1.27 | ICPMS |
2000 | Personarl Communication, Tohoku Univ. | | | | T. Ohba, T. Sugihara, T. Horie, S. Kawate |