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Translated from Steklo i Keramika, No. 6, p. 33, June, 1973.
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Bolgov, V.D. Friendship and mutual assistance born of competition. Glass Ceram 30, 417–418 (1973). https://doi.org/10.1007/BF00673902
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DOI: https://doi.org/10.1007/BF00673902