1. S. M. Manskaya and T. V. Drozdova, Geochemistry of Organic Matter [in Russian], Nauka, Moscow (1964).
2. J. J. R. Frausto da Silva and R. J.P. Williams, The Biological Chemistry of the Elements: The Inorganic Chemistry of Life, Oxford University Press (2001).
3. L. R. Nozdryukhina, Biological Role of Microelements in the Organism of Human Beings and Animals [in Russian], Nauka, Moscow (1971).
4. A. P. Avtsyn, A. A. Zhavoronkov, M. A. Rish, L. S. Strochkova, Human Microelementoses: Ethiology, Classificartion, Organopathology [in Russian], Meditsina, Moscow (1991).
5. I. D. Keller, Principles of Chemical Weathering, in: Geochemistry of Lithogenesis [Russian translation], Izd. Inostrannaya Literatura, Moscow (1963).