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Translated from Steklo i Keramika, No. 9, pp. 11–12, September, 1974.
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Leichenko, I.Y. The most important factor in progress. Glass Ceram 31, 619–621 (1974). https://doi.org/10.1007/BF00675507
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DOI: https://doi.org/10.1007/BF00675507