1. L. A. Zhunin et al., Pyroxene Ceramics [in Russian], V. I. Lenin Belorussian State University, Minsk (1977).
2. V. Éitel', Physical Chemistry of Silicates [Russian translation], Izd. Inostr., Moscow (1962).
3. V. N. Belov, Trans. of the 6th Conference on Experimental and Technical Mineralogy and Petrography [in Russian], Izd. Akad. Nauk SSSR, Moscow (1962), p. 7.
4. Glass Handbook [in Russian], Vol. 1, Stroiizdat, Moscow (1964).