1. V. I. Vernadskii, Biogeochemical Studies of 1922–1932 (Akad. Nauk SSSR, Moscow, Leningrad, 1940) [in Russian].
2. N. N. Moiseev, V. V. Aleksandrova, and A. M. Tarko, Man and the Biosphere (Nauka, Moscow, 1985) [in Russian].
3. A. A. Kist, Phenomenology of Biogeochemistry and Bioinorganic Chemistry (FAN, Tashkent, 1987), p. 236 [in Russian].
4. V. I. Vernadskii, Selected Works, in 5 vols. (Akad. Nauk SSSR, Moscow, 1954), vol. 5 [in Russian]; http://vernadsky.lib.ru .
5. IAEA, NAHRES-75, Technical Report (IAEA, Vienna, 2003), pp. 1–173.