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Translated from Steklo i Keramika, No. 5, p. 7, May, 1974.
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Lupin, L.N. Constant attention to product quality. Glass Ceram 31, 313–314 (1974). https://doi.org/10.1007/BF00675842
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DOI: https://doi.org/10.1007/BF00675842