1. K. S. Evstrop’ev and N. A. Toropov, Chemistry of Silicon and Physical Chemistry of Silicates [in Russian], Gos. Izd. Lit. po Stroitel’nym Materialam, Moscow (1956), pp. 75–152.
2. A. M. Tyutikov, Fiz. Khim. Stekla, 7, No. 6, 705–711 (1981).
3. S. V. Nemilov, Neorg. Mater., 4, 952–955 (1968).
4. V. V. Vargin, K. S. Evstrop’ev, K. A. Krakau, et al., in: Physicochemical Properties of Glasses and Their Dependence on Composition [in Russian], V. G. Voano, ed., Gizlegprom, Moscow–Leningrad (1937), p. 199.
5. O. V. Mazurin, M. V. Strel’tsina, and T. P. Shvaiko–Svaikovskaya, Glassy Silica and Two-Component Silicate Systems. Handbook [in Russian], Nauka, Leningrad (1973), pp. 245–272.