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Translated from Steklo i Keramika, No.11, p.45, November, 1970.
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Izotov, V.V., Grinenko, T.I. Insulators awarded the Mark of Quality. Glass Ceram 27, 696–697 (1970). https://doi.org/10.1007/BF00674640
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DOI: https://doi.org/10.1007/BF00674640