Approximation in the mean of classes of functions with fractional derivatives by their Abel–Poisson integrals von T. V. Zhigallo

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Approximation of functions satisfying the Lipschitz condition on a finite segment of the real axis by Poisson–Chebyshev's integrals von T. V. Zhigallo

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On some boundary properties of Abel–Poisson integrals von T. V. Zhigallo, N. I. Padalko

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