Variation of the norms in the problem of best approximation
Matematičeskie zametki, Tome 29 (1981) no. 2, pp. 181-196.

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     author = {V. I. Berdyshev},
     title = {Variation of the norms in the problem of best approximation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {181--196},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1981_29_2_a2/}
}
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V. I. Berdyshev. Variation of the norms in the problem of best approximation. Matematičeskie zametki, Tome 29 (1981) no. 2, pp. 181-196. http://geodesic.mathdoc.fr/item/MZM_1981_29_2_a2/