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Translated from Steklo i Keramika, No. 6, p. 4, June, 1974.
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Petrenko, V.K. Our commitments are being fulfilled. Glass Ceram 31, 383–384 (1974). https://doi.org/10.1007/BF00677070
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DOI: https://doi.org/10.1007/BF00677070