Estimates for the best approximations and approximation by Fourier sums of classes of convolutions of periodic functions of not high smoothness in integral metrics by T. A. Stepaniuk

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Approximation of the classes of generalized Poisson integrals by Fourier sums in metrics of the spaces L_s by A. S. Serdiuk, T. A. Stepaniuk

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Uniform approximations by Fourier sums on the classes of convolutions with generalized Poisson kernels by A. S. Serdiuk, T. A. Stepaniuk

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Estimates of the best orthogonal trigonometric approximations of the classes of convolutions of periodic functions of not high smoothness by A. S. Serdiuk, T. A. Stepaniuk

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Estimates of the best m-term trigonometric approximations of classes of analytic functions by A. S. Serdiuk, T. A. Stepaniuk

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Order Estimates for the Best Orthogonal Trigonometric Approximations of the Classes of Convolutions of Periodic Functions of Low Smoothness by A. S. Serdiuk, T. A. Stepaniuk

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Estimations of the Best Approximations for the Classes of Infinitely Differentiable Functions in Uniform and Integral Metrics by A. S. Serdiuk, T. A. Stepaniuk

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Order Estimates for the Best Approximations and Approximations by Fourier Sums in the Classes of Convolutions of Periodic Functions of Low Smoothness in the Uniform Metric by A. S. Serdiuk, T. A. Stepaniuk

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Order estimates for the best approximation and approximation by Fourier sums of classes of infinitely differentiable functions by A. S. Serdiuk, T. A. Stepaniuk

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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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