$K$-functionals and extreme problems of the theory of approximation for classes of analytic functions in the circle. I by Vakarchuk, S. B., Vakarchuk, M. B., Вакарчук, С. Б., Вакарчук, М. Б.

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$K$-functionals and extreme problems of the theory of approximation of the classes of analytic functions in a circle. II by Vakarchuk, S. B., Vakarchuk, M. B., Вакарчук, С. Б., Вакарчук, М. Б.

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Exact values of widths for certain functional classes by Vakarchuk, S. B., Вакарчук, С. Б.

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On the best polynomial approximation of entire transcendental functions in banach spaces. I by Vakarchuk, S. B., Вакарчук, С. Б.

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Widths of classes of functions in the weight space $L_{2,\gamma}(\mathbb{R}), \gamma=\exp(-x^2)$ by Vakarchuk, S. B., Вакарчук, С. Б.

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On diameters of some classes of analytical functions. II. by Vakarchuk , S. B., Вакарчук , С. Б.

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Diameters of certain classes of analytical functions. I by Vakarchuk , S. B., Вакарчук, С. Б.

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The best polynomial approximation of functions analytical in the single circle by Vakarchuk, S. B., Вакарчук, С. Б.

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On total moduli of continuity for $2\pi$-periodic functions of two variables in the space $L_{2,2}$ by Vakarchuk, M. B., Vakarchuk, S. B., Вакарчук, М. Б., Вакарчук, С. Б., Вакарчук, М. Б., Вакарчук, С. Б.

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On the exponential decay of vibrations of damped elastic media by Vakarchuk, M. B., Vakarchuk, S. B., Вакарчук, М. Б., Вакарчук, С. Б., Вакарчук, М. Б., Вакарчук, С. Б.

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On the estimates of widths of the classes of functions defined by the generalized moduli of continuity and majorants in the weighted space $L_{2x} (0,1)$ by Vakarchuk, S. B., Вакарчук, С. Б., Вакарчук, С. Б.

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Generalized characteristics of smoothness and some extremе problems of the approximation theory of functions in the space $L_2 (R)$. I by Vakarchuk, S. B., Вакарчук, С. Б., Вакарчук, С. Б.

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Generalized characteristics of smoothness and some extreme problems of the approximation theory of functions in the space $L_2 (R)$. II by Vakarchuk, S. B., Вакарчук, С. Б., Вакарчук, С. Б.

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On the moduli of continuity and fractional-order derivatives in the problems of best mean-square approximations by entire functions of the exponential type on the entire real axis by Vakarchuk, S. B., Вакарчук, С. Б., Вакарчук, С. Б.

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Jackson-type inequalities with generalized modulus of continuity and exact values of the $n$-widths of the classes of $(ψ,β)$-differential functions in $L_2$. I by Vakarchuk, S. B., Вакарчук, С. Б., Вакарчук, С. Б.

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Jackson-type inequalities with generalized modulus of continuity and exact values of the $n$-widths of the classes of $(ψ,β)$-differentiable functions in $L_2$. II by Vakarchuk, S. B., Вакарчук, С. Б., Вакарчук, С. Б.

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Jackson-Type Inequalities for the Special Moduli of Continuity on the Entire Real Axis and the Exact Values of Mean $ν$ - Widths for the Classes of Functions in the Space $L_2 (ℝ)$... by Vakarchuk, S. B., Вакарчук, С. Б., Вакарчук, С. Б.

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Best mean-square approximation of functions defined on the real axis by entire functions of exponential type by Vakarchuk, S. B., Вакарчук, С. Б., Вакарчук, С. Б.

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Jackson-type inequalities and exact values of widths of classes of functions in the spaces $S^p , 1 ≤ p < ∞$ by Vakarchuk, S. B., Вакарчук, С. Б., Вакарчук, С. Б.

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On some extremal problems of approximation theory in the complex plane by Vakarchuk, S. B., Вакарчук, С. Б., Вакарчук, С. Б.

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