Lower estimations of widths some classes of periodic functions
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Proceedings of the All-Union school on the theory of functions, Tome 198 (1992), pp. 242-267.

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@article{TM_1992_198_a13,
     author = {V. T. Shevaldin},
     title = {Lower estimations of widths some classes of periodic functions},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {242--267},
     publisher = {mathdoc},
     volume = {198},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1992_198_a13/}
}
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V. T. Shevaldin. Lower estimations of widths some classes of periodic functions. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Proceedings of the All-Union school on the theory of functions, Tome 198 (1992), pp. 242-267. http://geodesic.mathdoc.fr/item/TM_1992_198_a13/