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Serdyuk, A.S. and Sokolenko , I.V. 2022. Approximation by Fourier sums in classes of Weyl – Nagy differentiable functions with high exponent of smoothness. Ukrains’kyi Matematychnyi Zhurnal. 74, 5 (Jun. 2022), 685 - 700. DOI:https://doi.org/10.37863/umzh.v74i5.7136.