Best $M$-Term trigonometric approximations of the classes $B^{Ω}_{p,θ}$ of periodic functions of many variables von Voitenko, S. P., Войтенко, С. П.

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Best orthogonal trigonometric approximations of the classes $B^{Ω}_{p,θ}$ of periodic functions of many variables von Voitenko, S. P., Войтенко, С. П.

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