Literature cited
A. I. Stepanets, “On a problem of A. N. Kolmogorov in the case of functions of two variables, ” Ukrainsk. Matem. Zh.,24, No. 56 (1972).
I. M. Ryzhik and I. S. Gradshtein, Tables of Integrals, Sums, Series, and Products fin Russian], Nauka, Moscow-Leningrad (1951).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 24, No. 6, pp. 781–799, November–December, 1972.
I express my deep gratitude to V. K. Dzyadyk for suggesting this topic as well as for the careful discussions of the obtained results.
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Stepanets, A.I. Fourier series approximation of functions which satisfy Lipschitz conditions. Ukr Math J 24, 627–640 (1972). https://doi.org/10.1007/BF01085413
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DOI: https://doi.org/10.1007/BF01085413