Approximation by spline functions, and estimates of widths
Informatics and Automation, Приближение периодических функций, Tome 109 (1971), pp. 35-60.

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     author = {Yu. N. Subbotin},
     title = {Approximation by spline functions, and estimates of widths},
     journal = {Informatics and Automation},
     pages = {35--60},
     publisher = {mathdoc},
     volume = {109},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1971_109_a3/}
}
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Yu. N. Subbotin. Approximation by spline functions, and estimates of widths. Informatics and Automation, Приближение периодических функций, Tome 109 (1971), pp. 35-60. http://geodesic.mathdoc.fr/item/TRSPY_1971_109_a3/