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Translated from Steklo i Keramika, No. 9, pp. 2–3, September, 1976.
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Sudarev, M.V. Our beacons. Glass Ceram 33, 539–541 (1976). https://doi.org/10.1007/BF00701480
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DOI: https://doi.org/10.1007/BF00701480