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Translated from Steklo i Keramika, No. 6, p. 20, June, 1973.
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Gardyga, M.V., Minaev, V.P. Success in completing the Ninth Five-Year Plan. Glass Ceram 30, 389–390 (1973). https://doi.org/10.1007/BF00673889
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DOI: https://doi.org/10.1007/BF00673889