Literature cited
K. K. Vilnis, Steklo (Byulleten' GIS), No. 2 (1959).
F. G. Solinov and N. A. Pankova, Steklo (Byulleten' GIS), No. 3 (1964).
N. A. Penkova and L. Ya. Levitin, Steklo i Keramika, No. 10 (1969).
K. K. Vilnis and M. G. Stepanenko, Steklo i Keramika, No. 3 (1959).
T. B. Zhuzen et al., Steklo i Keramika, No. 9 (1971).
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Translated from Steklo i Keramika, No. 4, pp. 4–6, April, 1973.