Best trigonometric and bilinear approximations for the classes of (ψ, β) -differentiable periodic functions von V. V. Shkapa

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Approximating Characteristics of the Classes L_(β,p) von V. V. Shkapa

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Grid-algorithms on classes of (ψ,β)-differentiable functions von V. V. Shkapa

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Estimates of the best M-term and orthogonal trigonometric approximations of functions of classes LΨ(β,ρ) in the uniform metrics von V. V. Shkapa

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Best orthogonal trigonometric approximations of functions from classes Lш(в,1) von V. V. Shkapa

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Best approximations of analogous of the Brenoulli kernels and classes of the (ψ,β) differentiable periodic functions von V. V. Shkapa

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Estimates of the best orthogonal trigonometric approximations and orthoprojective widths of the classes of periodic functions of many variables in a uniform metric von H. M. Vlasyk, V. V. Shkapa, I. V. Zamrii

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