On best approximation by splines of function classes on the line
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Investigations in the theory of differentiable functions of many variables and its applications. Part 14, Tome 194 (1992), pp. 148-159.

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     author = {G. G. Magaril-Il'yaev},
     title = {On best approximation by splines of function classes on the line},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {148--159},
     publisher = {mathdoc},
     volume = {194},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1992_194_a9/}
}
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G. G. Magaril-Il'yaev. On best approximation by splines of function classes on the line. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Investigations in the theory of differentiable functions of many variables and its applications. Part 14, Tome 194 (1992), pp. 148-159. http://geodesic.mathdoc.fr/item/TM_1992_194_a9/