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Translated from Steklo i Keramika, No. 12, p. 20, December, 1973.
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Ulitina, A.S., Sidel'nikova, L.G. Certification of products. Glass Ceram 30, 840 (1973). https://doi.org/10.1007/BF00677111
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DOI: https://doi.org/10.1007/BF00677111