Literature cited
V. I. Orzhevskii and V. I. Vanin, Steklo i Keram., No. 5 (1960).
M. A. Tsaritsin and M. I. Dolgov, Steklo i Keram., No. 6 (1965).
É. É. Mazo et al., Steklo i Keram., No. 1 (1967).
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Translated from Steklo i Keramika, No. 5, p. 31, May, 1974.