Geodesic
Some remarks on approximation of functions of several variables
Sbornik. Mathematics, Tome 15 (1971) no. 4, pp. 493-511 Cet article a éte moissonné depuis la source Math-Net.Ru

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The work is devoted to questions of approximation of smooth functions of $n$ variables. Bibliography: 11 titles. 
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K. I. Babenko. Some remarks on approximation of functions of several variables. Sbornik. Mathematics, Tome 15 (1971) no. 4, pp. 493-511. http://geodesic.mathdoc.fr/item/SM_1971_15_4_a0/

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[8] S. M. Nikolskii, “O priblizhenii funktsii, udovletvoryayuschikh usloviyu Lipshitsa”, DAN SSSR, 52:1 (1946), 7–10

[9] R. L. Frum-Ketkov, “O nekotorykh svoistvakh prostranstv funktsii konechnoi gladkosti”, Uspekhi matem. nauk, XX:4(124) (1965), 181–186 | MR

[10] A. N. Kolmogorov, V. M. Tikhomirov, “$\varepsilon$-entropiya i $\varepsilon$-emkost mnozhestv v funktsionalnykh prostranstvakh”, Uspekhi matem. nauk, XIII:2(86) (1959), 3–86 | MR

[11] A. G. Vitushkin, “K trinadtsatoi probleme Gilberta”, DAN SSSR, 95:4 (1955), 701–704