@article{DAN_1962_144_1_a4,
     author = {E. G. Gol'shtein},
     title = {A general formulation of the best approximation problem},
     journal = {Doklady Akademii Nauk},
     pages = {21--22},
     publisher = {mathdoc},
     volume = {144},
     number = {1},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_144_1_a4/}
}