Trigonometric and linear widths for the classes of periodic multivariable functions von A. S. Romanjuk

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Entropy numbers and the widths of the classes Brp,θ of periodic functions of many variables von A. S. Romanjuk

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Estimation of the Entropy Numbers and Kolmogorov Widths for the Nikol'skii–Besov Classes of Periodic Functions of Many Variables von A. S. Romanjuk

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On the Problem of Linear Widths of the Classes Brp,θ of Periodic Functions of Many Variables von A. S. Romanjuk

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Estimates of the entropy numbers and е-entropy of the Nikol'skii-Besov classes of periodic functions of several variables von A. S. Romanjuk

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Estimates for the best bilinear approximations of the classes Brp,ɵ and singular numbers of integral operators von A. S. Romanjuk, V. S. Romanjuk

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Best Bilinear Approximations for the Classes of Functions of Many Variables von A. S. Romanjuk, V. S. Romanjuk

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