Literature cited
M. É. Kats, Steklo i Keramika, No. 5 (1971).
M. É. Kats and K. K. Kvyatkovskaya, Steklo i Keramika, No. 2 (1972).
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Translated from Steklo i Keramika, No. 8, pp. 36–37, August, 1976.