@article{DAN_1961_141_6_a0,
     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/}
}