1. Environmental radioactivity in Denmark in 1988 and 1989;Aarkrog,1991
2. Conclusion of the Commission on the estimation of the ecological situation in the region of production association ‘Majak’, organized by the direction of Presidium of Academy Science. No. 1140-501//Russia;Academy of Science;J. Radiobiology,1991
3. Environmental Radioactivity;Eisenbud,1987
4. Behaviour of natural (Th, U) and artificial (Pu, Am) actinides in coastal waters;Holm,1979