Best approximation of linear operators
Matematičeskie zametki, Tome 1 (1967) no. 2, pp. 137-148.

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     author = {S. B. Stechkin},
     title = {Best approximation of linear operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {137--148},
     publisher = {mathdoc},
     volume = {1},
     number = {2},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1967_1_2_a1/}
}
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S. B. Stechkin. Best approximation of linear operators. Matematičeskie zametki, Tome 1 (1967) no. 2, pp. 137-148. http://geodesic.mathdoc.fr/item/MZM_1967_1_2_a1/