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Translated from Steklo i Keramika, No. 5, p. 45, May, 1971.
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Selezneva, R.V. Quality sign for Porcelain. Glass Ceram 28, 329 (1971). https://doi.org/10.1007/BF00675482
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DOI: https://doi.org/10.1007/BF00675482