@article{DAN_1971_198_2_a8,
     author = {V. M. Mordashev},
     title = {On a linear combination of functions of several variables best approximated by a sum of functions of a smaller number of variables},
     journal = {Doklady Akademii Nauk},
     pages = {290},
     publisher = {mathdoc},
     volume = {198},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_198_2_a8/}
}