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Translated from Steklo i Keramika, No. 5, p. 38, May, 1973.
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Vvedenskii, S.M. Results of competition. Glass Ceram 30, 352–353 (1973). https://doi.org/10.1007/BF00674671
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DOI: https://doi.org/10.1007/BF00674671