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Translated from Steklo i Keramika, No. 5, pp. 5–6, May, 1978.
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Frolov, A.P. A new level of competition. Glass Ceram 35, 254–256 (1978). https://doi.org/10.1007/BF00695549
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DOI: https://doi.org/10.1007/BF00695549