Geodesic
Extremum problems in the class of trigonometric polynomials
Doklady Akademii Nauk, Tome 121 (1958) no. 3, pp. 415-417.

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

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     author = {I. I. Ibragimov},
     title = {Extremum problems in the class of trigonometric polynomials},
     journal = {Doklady Akademii Nauk},
     pages = {415--417},
     publisher = {mathdoc},
     volume = {121},
     number = {3},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_121_3_a4/}
}
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I. I. Ibragimov. Extremum problems in the class of trigonometric polynomials. Doklady Akademii Nauk, Tome 121 (1958) no. 3, pp. 415-417. http://geodesic.mathdoc.fr/item/DAN_1958_121_3_a4/