1. Cotton, F. A., Wilkinson, G.: Advanced Inorganic Chemistry, Wiley, New York, 1980, Chap. 16
2. Bagnall, K. W.: The Chemistry of Selenium, Tellurium and Polonium, Elsevier, Amsterdam, 1966
3. Kudryavtsev, A. A.: The Chemistry and Technology of Selenium and Tellurium (translated and revised by Elkin, E. M.), Collet's, London, 1974
4. Pauling, L.: The Nature of the Chemical Bond, Cornell University Press, Ithaca, N. Y., 1960, Chaps. 3 and 7
5. Bisbjerg, B.: Studies on Selenium in Plants and Soils, Danish Atomic Energy Commission, 1972