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Translated from Steklo i Keramika, No. 6, p. 34, June, 1978.
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Islamov, T. Emblem of quality awarded to seventeen products. Glass Ceram 35, 358–359 (1978). https://doi.org/10.1007/BF00697893
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DOI: https://doi.org/10.1007/BF00697893