An~inverse approximation theorem in various metrics
Matematičeskie zametki, Tome 50 (1991) no. 6, pp. 57-65.

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     author = {N. A. Il'yasov},
     title = {An~inverse approximation theorem in various metrics},
     journal = {Matemati\v{c}eskie zametki},
     pages = {57--65},
     publisher = {mathdoc},
     volume = {50},
     number = {6},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1991_50_6_a6/}
}
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N. A. Il'yasov. An~inverse approximation theorem in various metrics. Matematičeskie zametki, Tome 50 (1991) no. 6, pp. 57-65. http://geodesic.mathdoc.fr/item/MZM_1991_50_6_a6/