@article{DAN_1976_227_2_a4,
     author = {I. I. Ibragimov and N. I. Shikhaliev},
     title = {On the best polynomial approximation in a space of analytic functions},
     journal = {Doklady Akademii Nauk},
     pages = {280--283},
     publisher = {mathdoc},
     volume = {227},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_227_2_a4/}
}