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Translated from Steklo i Keramika, No. 8, pp. 34–35, August, 1972.
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Klimenko, A.A. Competitions are spreading. Glass Ceram 29, 547–548 (1972). https://doi.org/10.1007/BF00672353
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DOI: https://doi.org/10.1007/BF00672353