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Translated from Steklo i Keramika, Vol. 31, No. 3, pp. 9–11, March, 1974.
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Shepelev, D.N. On the road to technical progress. Glass Ceram 31, 166–169 (1974). https://doi.org/10.1007/BF00675957
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DOI: https://doi.org/10.1007/BF00675957