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Translated from Steklo i Keramika, No. 1, p. 39, January, 1978.
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Shchapova, Y.L. Seventh Congress on the History of Glass. Glass Ceram 35, 61–62 (1978). https://doi.org/10.1007/BF00695108
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DOI: https://doi.org/10.1007/BF00695108