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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 36, No. 2, pp. 160–165, March–April, 1984.
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Kotlyar, B.D. A class of densities of sets of natural numbers. Ukr Math J 36, 143–148 (1984). https://doi.org/10.1007/BF01066945
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DOI: https://doi.org/10.1007/BF01066945