Approximation of the classes of convolutions of periodic functions by Zygmund sums in integral metrics von U. Z. Hrabova

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Order Estimates for the Best Approximations and Approximations by Fourier Sums of the Classes of (ψ, β)-Differential Functions von U. Z. Hrabova, A. S. Serdiuk

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Estimates of uniform approximations by Zygmund sums on classes of convolutions of periodic functions von A. S. Serdiuk, U. Z. Hrabova

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Approximation of continuous functions given on the real axis by three-harmonic Poisson operators von U. Z. Hrabova, I. V. Kalchuk

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Approximation of classes Cψβ,∞ by three-harmonic Poisson integrals in uniform metric (low smoothness) von U. Z. Hrabova, I. V. Kalchuk

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Solution of the Kolmogorov-Nikol'skii problem for three-harmonic Poisson integrals on classes Cψ(β,∞) von U. Z. Hrabova, I. V. Kalchuk

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Approximation of functions from the classes WrβHα by Weierstrass integrals von U. Z. Hrabova, I. V. Kalchuk, T. A. Stepaniuk

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Approximative properties of the three-harmonic Poisson integrals on the classes W von U. Z. Hrabova, I. V. Kalchuk, L. I. Filozof

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Approximation of the classes Wβ Hα by three-harmonic Poisson integrals von I. V. Kalchuk, V. I. Kravets, U. Z. Hrabova

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On approximation of classes W1∞ by Poisson sums von M. V. Hembarskyi, U. Z. Hrabova, I. V. Kalchuk

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