The generalized Lorentz theorem on Fourier series with monotone coefficients and its converse
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1998), pp. 15-17.

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V. È. Gheit. The generalized Lorentz theorem on Fourier series with monotone coefficients and its converse. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1998), pp. 15-17. http://geodesic.mathdoc.fr/item/IVM_1998_4_a1/

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[2] Lorentz G. G., “Fourier Koeffizienten und Funktionenklassen”, Math. Z., 51 (1948), 135–149 | DOI | MR | Zbl

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[4] Bari N. K., Trigonometricheskie ryady, Fizmatgiz, M., 1961, 936 pp. | MR