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

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Approximating Characteristics of the Classes $L_{β,p}^{ψ}$ of Periodic Functions in the Space $L_q$ von Shkapa, V. V., Шкапа, В. В.

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