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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 39, No. 2, pp. 185–190, March–April, 1987.
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Kushpel', A.K. Behavior of Lebesgue constants for linear methods of summing fourier series giving the best order approximation. Ukr Math J 39, 154–157 (1987). https://doi.org/10.1007/BF01057496
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DOI: https://doi.org/10.1007/BF01057496