Geodesic
Stechkin's works devoted to optimal methods of approximation
Fundamentalʹnaâ i prikladnaâ matematika, Tome 3 (1997) no. 4, pp. 961-965.

Voir la notice de l'article provenant de la source Math-Net.Ru

The article is devoted to Stechkin's contribution to the theory of $n$-width and further development of his ideas. 
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     title = {Stechkin's works devoted to optimal methods of approximation},
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È. M. Galeev; V. M. Tikhomirov. Stechkin's works devoted to optimal methods of approximation. Fundamentalʹnaâ i prikladnaâ matematika, Tome 3 (1997) no. 4, pp. 961-965. http://geodesic.mathdoc.fr/item/FPM_1997_3_4_a2/