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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 9, No. 2, pp. 449–455, March–April, 1968.
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Blyumin, S.L. On linear methods of summation of Fourier series with respect to multiplicative systems. Sib Math J 9, 339–344 (1968). https://doi.org/10.1007/BF02204797
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DOI: https://doi.org/10.1007/BF02204797