Estimates of approximation characteristics and properties of operators of the best approximation for the classes of periodic functions in the space $B_{1,1}$ by Romanyuk, A. S., Yanchenko, S. Ya., Романюк, А. С., Янченко, С. Я.

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Sharp Remez type inequalities estimating the $L_q$ -norm of a function via its $L_p$ -norm by Kofanov, V. A., Olexandrova, T. V., Кофанов, Владимир Александрович, Кофанов, В. О., Олександрова, Т. В.

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Approximation of classes of periodic functions in one and many variables from the Nikol’skii – Besov and Sobolev spaces by Romanyuk, A. S., Yanchenko, S. Ya., Романюк, А. С., Янченко, С. Я.

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Best approximations for classes of periodic functions of many variables with bounded dominating mixed derivative by Pozharska, K., Romanyuk , A., Yanchenko, S., Пожарська, Катерина, Романюк, Анатолій, Янченко, Сергій

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Boyanov–Naidenov problem and the Kolmogorov-type inequalities for functions on the real axis by Kofanov, V., Кофанов, Владимир Александрович, Кофанов, Володимир

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Boyanov–Naydenov problem and the inequalities of various metrics by Doroshenko, D., Kofanov, V., Дорошенко, Данііл, Кофанов, Володимир, Кофанов, Владимир Александрович

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