Widths of a class of periodic functions defined by a differential operator
Matematičeskie zametki, Tome 42 (1987) no. 2, pp. 194-206.

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     author = {S. I. Novikov},
     title = {Widths of a class of periodic functions defined by a differential operator},
     journal = {Matemati\v{c}eskie zametki},
     pages = {194--206},
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_42_2_a3/}
}
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S. I. Novikov. Widths of a class of periodic functions defined by a differential operator. Matematičeskie zametki, Tome 42 (1987) no. 2, pp. 194-206. http://geodesic.mathdoc.fr/item/MZM_1987_42_2_a3/