1. P. Marcel, Ann. Chim. Sci. Mater., 28, No. 2, 87–94 (2003).
2. A. G. Vlasov and V. A. Florinskii, eds., Structure and Physicochemical Properties of Inorganic Glasses [in Russian], Khimiya, Leningrad (1974), pp. 285–350.
3. I. N. Morozova and A. K. Yakhkind, Fiz. i Khim. Stekla, 3, No. 3, 197–201 (1977).
4. Ya. Dimitriev, Stroitelni Materiali i Silikatna Promyshlenost (Bolgariya), 24, No. 10, 25–30 (1983).
5. G. E. Rachkovskaya and G. B. Zakharevich, Steklo i Keramika, No. 4, 13–16 (2002).