Geodesic
The generalized Lorentz theorem on Fourier series with monotone coefficients and its converse
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1998), pp. 15-17 
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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     author = {V. \`E. Gheit},
     title = {The generalized {Lorentz} theorem on {Fourier} series with monotone coefficients and its converse},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {15--17},
     year = {1998},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1998_4_a1/}
}
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[4] Bari N. K., Trigonometricheskie ryady, Fizmatgiz, M., 1961, 936 pp. | MR