@article{DAN_1984_279_2_a2,
     author = {M.-B. Babayev},
     title = {Best approximation by functions of fewer variables},
     journal = {Doklady Akademii Nauk},
     pages = {273--277},
     publisher = {mathdoc},
     volume = {279},
     number = {2},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_279_2_a2/}
}