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Translated from Steklo i Keramika, No.11, pp.41–42, November, 1970.
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Semenov, E.I. Perfection of a bonus awarding system. Glass Ceram 27, 689–691 (1970). https://doi.org/10.1007/BF00674636
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DOI: https://doi.org/10.1007/BF00674636