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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 25, No. 2, pp. 267–277, March–April, 1973.
In conclusion I wish to thank V. T. Gavrilyuk for formulating the problem and for his assistance.
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Demchenko, A.G. Approximation in the mean of functions of class WrH[ω]L by Fourier series. Ukr Math J 25, 215–221 (1973). https://doi.org/10.1007/BF01096982
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DOI: https://doi.org/10.1007/BF01096982