Geodesic
Approximation of discontinuous functions by Fourier sums
Doklady Akademii Nauk, Tome 180 (1968) no. 5, pp. 1033-1036.

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     author = {G. I. Natanson},
     title = {Approximation of discontinuous functions by {Fourier} sums},
     journal = {Doklady Akademii Nauk},
     pages = {1033--1036},
     publisher = {mathdoc},
     volume = {180},
     number = {5},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_180_5_a3/}
}
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G. I. Natanson. Approximation of discontinuous functions by Fourier sums. Doklady Akademii Nauk, Tome 180 (1968) no. 5, pp. 1033-1036. http://geodesic.mathdoc.fr/item/DAN_1968_180_5_a3/