Literature cited
A. I. Stepanets, “Approximation of certain classes of differentiable periodic functions of two variables by Fourier sums,” Ukrainsk. Matem. Zh.,25, No. 5 (1973).
A. N. Kolmogorov, “Zur Grossennordnung des Restgliedes Fourierischer Reihen differenzierbarer Functionen,” Ann. of Math.,36, No. 2 (1935).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 26, No. 2, pp. 205–215, March–April, 1974.
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Stepanets, A.I. Approximation of certain classes of periodic functions of two variables by linear methods of summation of their Fourier series. Ukr Math J 26, 168–176 (1974). https://doi.org/10.1007/BF01085716
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DOI: https://doi.org/10.1007/BF01085716