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Translated from Matematicheskie Zametki, Vol. 44, No. 4, pp. 506–516, October, 1988.
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Pachulia, N.L., Stepanets, A.I. Strong summability of fourier series on classes of (ψ, β)-differentiable functions. Mathematical Notes of the Academy of Sciences of the USSR 44, 758–764 (1988). https://doi.org/10.1007/BF01158920
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DOI: https://doi.org/10.1007/BF01158920