Order Estimates for the Best Approximations and Approximations by Fourier Sums of the Classes of (ψ, β)-Differential Functions by Hrabova, U. Z., Serdyuk, A. S., Грабова, У. З., Сердюк, А. С.

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On the approximation of the classes $W_{β}^rH^{α}$ by biharmonic Poisson integrals by Hrabova, U. Z., Kalchuk, I. V., Stepanyuk, T. A., Грабова, У. З., Кальчук, І. В., Степанюк, Т. А.

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Approximation of functions from the classes $W_{β}^r H^{α }$ by Weierstrass integrals by Hrabova, U. Z., Kalchuk, I. V., Stepanyuk, T. A., Грабова, У. З., Кальчук, І. В., Степанюк, Т. А.

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