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Translated from Steklo i Keramika, No. 8, p. 36, August, 1978.
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Kolesnikova, L.V. People's University of Technical and Economic Studies. Glass Ceram 35, 500–502 (1978). https://doi.org/10.1007/BF00702228
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DOI: https://doi.org/10.1007/BF00702228