Approximation by piecewise polynomial functions
Doklady Akademii Nauk, Tome 141 (1961) no. 6, pp. 1283-1286.

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     author = {Yu. A. Brudnyi and I. E. Gopengauz},
     title = {Approximation by piecewise polynomial functions},
     journal = {Doklady Akademii Nauk},
     pages = {1283--1286},
     publisher = {mathdoc},
     volume = {141},
     number = {6},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_141_6_a0/}
}
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Yu. A. Brudnyi; I. E. Gopengauz. Approximation by piecewise polynomial functions. Doklady Akademii Nauk, Tome 141 (1961) no. 6, pp. 1283-1286. http://geodesic.mathdoc.fr/item/DAN_1961_141_6_a0/