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B. V. Zakhar'in, V. F. Babich, K. L. Ryzhikov, and Y. N. Kurochka, Author's Patent No. 215714.
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The main task — Technical progress. Glass Ceram 30, 401–402 (1973). https://doi.org/10.1007/BF00673896
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DOI: https://doi.org/10.1007/BF00673896