Ortho-projective widths of classes $B_{p,\theta}^\Omega$ of periodic functions of many variables in the space $L_q$ von Derev’yanko, N. V., Дерев'янко, Н. В.

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Estimations of linear widths of the classes $H_p^\Omega$ periodic functions of many variables in the space $L_q$ von Derev’yanko, N. V., Дерев'янко, Н. В.

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