4Schwarz K, Foltz C M. Selenium as an integral of Factor 3 against dietary necrotic liver degeneration. J. American Chemical Soci. , 1957 (79) : 3292 - 3293
5Rotruck J T, Pope A L, Ganther H E, et al. Selenium: Biochemical role as a component of glutathione peroxidase. Science, 1973(179) :588 - 590
6Kohrl J, Brigelius Flohe R, Bock A, et al. Selenium in biology: facts and medical perspective. Bio. Chem. ,2000, 381(9 - 10) :849 - 864
7Brown K M, Arthur J R. Selenium, selenoproteins and human health: a review. Public Health Nutr.,2001(4):593 - 599