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Translated from Steklo i Keramika, No. 9, pp. 26–27, September, 1973.
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Zverev, L.N. Internal reserves. Glass Ceram 30, 623–625 (1973). https://doi.org/10.1007/BF00676060
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DOI: https://doi.org/10.1007/BF00676060