Geodesic
Best linear approximation of some classes of differentiable periodic functions
Matematičeskie zametki, Tome 27 (1980) no. 5, pp. 683-689

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     author = {V. F. Babenko and S. A. Pichugov},
     title = {Best linear approximation of some classes of differentiable periodic functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {683--689},
     publisher = {mathdoc},
     volume = {27},
     number = {5},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1980_27_5_a1/}
}
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V. F. Babenko; S. A. Pichugov. Best linear approximation of some classes of differentiable periodic functions. Matematičeskie zametki, Tome 27 (1980) no. 5, pp. 683-689. http://geodesic.mathdoc.fr/item/MZM_1980_27_5_a1/