1. G. P. Luchinskii, The Chemistry of Titanium (Khimiya, Moscow, 1971) [in Russian].
2. I. P. Dobrovol’skii, The Chemistry and Technology of the Oxide Compounds of Titanium (UrO AN SSSR, Sverdlovsk, 1988) [in Russian].
3. I. K. Karpov, K. V. Chudnenko, and D. A. Kulik, Am. J. Sci. 297, 767 (1997).
4. I. K. Karpov, K. V. Chudnenko, D. A. Kulik, and V. A. Bychinskii, Am. J. Sci. 302, 281 (2002).
5. A. K. Podshivalova, A. S. Chernyak, and I. K. Karpov, Zh. Neorg. Khim. 29(10), 2554 (1984).