1. Ya. D. Fridman, Bioinorganic Chemistry of Vitamins (Ilim, Bishkek, 1991) [in Russian].
2. A. A. Shabilalov, Extended Abstract of Doct. Chem. Dissertation (Tashkent, 1992).
3. A. A. Shabilalov, A. I. Yunuskhodzhaev, and M. A. Azizov, Coordination Features of Vitamin B6: Problems of Modern Bioinorganic Chemistry, Ed. by L. N. Mazalov (Novosibirsk, 1986) [in Russian].
4. A. A. Shabilalov, A. N. Yunuskhodzhaev, S. S. Faizieva, et al., Proc. All-Union Conf. On Problems of Microelements in Biology, Kishinev, 1981, p. 271.
5. M. A. Azizov, On Complex Compounds of Some Microelements with Bioactive Materials (Meditsina, Tashkent, 1969) [in Russian].