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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 9, No. 3, pp. 713–716, May–June, 1968.
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Zhuk, V.V. The approximation of periodic functions by linear summation methods for Fourier series. Sib Math J 9, 534–536 (1968). https://doi.org/10.1007/BF01040918
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DOI: https://doi.org/10.1007/BF01040918