Geodesic
The best approximation of periodic functions by trigonometric polynomials, and transforms of convolution type
Doklady Akademii Nauk, Tome 198 (1971) no. 4, pp. 776-778.

Voir la notice de l'article provenant de la source Math-Net.Ru

@article{DAN_1971_198_4_a9,
     author = {M. F. Timan},
     title = {The best approximation of periodic functions by trigonometric polynomials, and transforms of convolution type},
     journal = {Doklady Akademii Nauk},
     pages = {776--778},
     publisher = {mathdoc},
     volume = {198},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_198_4_a9/}
}
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M. F. Timan. The best approximation of periodic functions by trigonometric polynomials, and transforms of convolution type. Doklady Akademii Nauk, Tome 198 (1971) no. 4, pp. 776-778. http://geodesic.mathdoc.fr/item/DAN_1971_198_4_a9/