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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 32, No. 2, pp. 155–159, 194, and 288, March–April, 1980.
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Davydov, N.A. Conservative positive-matrix summation methods that are ineffective on some classes of sequences. Ukr Math J 32, 78–83 (1980). https://doi.org/10.1007/BF01092777
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DOI: https://doi.org/10.1007/BF01092777