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@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/} }
E. G. Gol'shtein. A general formulation of the best approximation problem. Doklady Akademii Nauk, Tome 144 (1962) no. 1, pp. 21-22. http://geodesic.mathdoc.fr/item/DAN_1962_144_1_a4/