@article{DAN_1971_200_3_a8,
     author = {R. A. Polyak},
     title = {On best convex {Cebysev} approximation},
     journal = {Doklady Akademii Nauk},
     pages = {538--540},
     publisher = {mathdoc},
     volume = {200},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_200_3_a8/}
}