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Translated from Steklo i Keramika, No. 6, pp. 30–31, June, 1973.
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Sadovskii, A.M. Economic knowledge for all. Glass Ceram 30, 412–414 (1973). https://doi.org/10.1007/BF00673900
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DOI: https://doi.org/10.1007/BF00673900