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 A new proof of Perron's theoremM. A. Evgrafov 77 On Perron's theorem in the theory of difference equationsA. O. Gel'fond, I. M. Kubenskaya 83 On absolute convergence of Fourier seriesS. B. Stechkin 87 Approximation properties of linear methods of summation of Fourier seriesA. F. Timan 99 On best approximation in the class of periodic functions having a bounded $s$-th derivative \$(0