Estimates for bilinear approximations of the classes TeX of periodic functions of two variables von Solich, K. V., Соліч, К. В.

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Kolmogorov widths of the classes $B^{\Omega}_{p, \theta}$ of periodic functions of many variables in the space $L_q$ von Solich, K. V., Соліч, К. В.

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Best bilinear approximations of the classes $S^{\Omega}_{p, \theta}B$ of periodic functions of many variables von Solich, K. V., Соліч, К. В.

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