Literature cited
S. G. Obukhov, Elektrichestvo, No. 11, 36 (1965).
I. G. Ibragimov and V. P. Nevzorov, Steklo Keram., No. 2, 8 (1974).
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Translated from Steklo i Keramika, No. 12, pp. 5–6, December, 1979.