1. Vinogradov, A.P., Chemical element composition of organisms and Mendeleyev’s periodic table, Tr. Biogeokhim. Lab. Akad. Nauk SSSR, 1935, vol. 3, p. 63.
2. Ivanov, V.V., Ekologicheskaya geokhimiya elementov (Ecological Geochemistry of Elements), 6 vols., Moscow: Nedra, 1994.
3. Emsley, J., The Elements, New York: Oxford University Press, 1989.
4. Skal’nyi, A.V., Khimicheskie elementy v fiziologii i ekologii cheloveka (Chemical Elements in Human Physiology and Ecology), Moscow: Oniks 21 Vek, 2004.
5. Prokhorova, G.V., Ivanov, V.M., and Bondar’, D.A., Vestn. Mosk. Univ., Ser. 2: Khim., 1998, vol. 39, no. 5, p. 219.