Estimates of norms of generalized derivatives of the Dirichlet type kernels with arbitrary choice of harmonics von Vlasyk, H. M., Власик, Г. М.

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Kolmogorov widths of the classes $L_{\beta, p}^\psi$ of periodic functions in the space $L_q$ von Vlasyk, H. M., Власик, Г. М.

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Orthoprotection widths of classes $L_{\beta, p}^\psi$ of periodic functions in the space $L_q$ von Vlasyk, H. M., Власик, Г. М.

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