Lower bounds for Kolmogorov widths in classes of convolutions with Neumann kernel von V. V. Bodenchuk

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Exact Values of Kolmogorov Widths for the Classes of Analytic Functions. II von V. V. Bodenchuk, A. S. Serdiuk

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Exact Values of Kolmogorov Widths for the Classes of Analytic Functions. I von V. V. Bodenchuk, A. S. Serdiuk

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Estimates from below for Kolmogorov widths in classes of Poisson integral von A. S. Serdiuk, V. V. Bodenchuk

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