On the approximation of functions from the Hölder class given on a segment by their biharmonic Poisson operators by Zhyhallo, K. M., Zhyhallo, T. V., Жигалло, К. М., Жигалло, Т. В.

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Approximating properties of biharmonic Poisson operators in the classes $\hat{L}^{\psi}_{\beta, 1}$ by Zhyhallo, T. V., Kharkevych, Yu. I., Жигалло, Т. В., Харкевич, Ю. І.

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Approximation of (ψ, β)-differentiable functions by Poisson integrals in the uniform metric by Zhyhallo, T. V., Kharkevych, Yu. I., Жигалло, Т. В., Харкевич, Ю. І.

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Approximation of functions from the class $\hat{C}^{\psi}_{\beta, \infty}$ by Poisson biharmonic operators in the uniform metric by Zhyhallo, T. V., Kharkevych, Yu. I., Жигалло, Т. В., Харкевич, Ю. І.

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Approximation of $(\psi, \beta)$-Differentiable Functions Defined on the Real Axis by Abel-Poisson Operators by Zhyhallo, T. V., Kharkevych, Yu. I., Жигалло, Т. В., Харкевич, Ю. І.

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Approximation of functions defined on the real axis by operators generated by λ-methods of summation of their Fourier integrals by Zhyhallo, T. V., Kharkevych, Yu. I., Жигалло, Т. В., Харкевич, Ю. І.

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