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Translated from Steklo i Keramika, No. 2, pp. 15–16, February, 1975.
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Shepelev, D.N. The battle for increased efficiency. Glass Ceram 32, 99–100 (1975). https://doi.org/10.1007/BF00678142
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DOI: https://doi.org/10.1007/BF00678142