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Translated from Steklo i Keramika, No. 6, p. 36, June, 1973.
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Kovalev, E.V., Tikhonov, E.I. Increasing durability. Glass Ceram 30, 423 (1973). https://doi.org/10.1007/BF00673905
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DOI: https://doi.org/10.1007/BF00673905