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

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

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Approximative properties of biharmonic Poisson integrals in the classes Wrβ by I. V. Kalchuk, Yu. I. Kharkevych

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

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Approximation of the classes W r_β,∞ by generalized Abel–Poisson integrals by I. V. Kalchuk, Yu. I. Kharkevych

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

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Approximative properties of the Weierstrass integrals on the classes WrβHα by U. Z. Grabova, I. V. Kalchuk, T. A. Stepaniuk

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

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

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

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