Geodesic
Exact constants in some converse theorems for approximations by trigonometric polynomials
Matematičeskie zametki, Tome 20 (1976) no. 5, pp. 787-792.

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@article{MZM_1976_20_5_a20,
     author = {A. F. Timan and V. N. Trofimov},
     title = {Exact constants in some converse theorems for approximations by trigonometric polynomials},
     journal = {Matemati\v{c}eskie zametki},
     pages = {787--792},
     publisher = {mathdoc},
     volume = {20},
     number = {5},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_20_5_a20/}
}
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A. F. Timan; V. N. Trofimov. Exact constants in some converse theorems for approximations by trigonometric polynomials. Matematičeskie zametki, Tome 20 (1976) no. 5, pp. 787-792. http://geodesic.mathdoc.fr/item/MZM_1976_20_5_a20/