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Translated from Steklo i Keramika, No. 3, p. 5, March, 1975.
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Pervoi, V.P., Dontsova, V.N. & Rudenko, U.S. The daily struggle for the sign of quality. Glass Ceram 32, 158–159 (1975). https://doi.org/10.1007/BF00679043
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DOI: https://doi.org/10.1007/BF00679043