Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1962_4_a0, author = {M. F. Bezborodnikov}, title = {On the best polynomial approximation of functions of several variables}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {3--12}, publisher = {mathdoc}, number = {4}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1962_4_a0/} }
M. F. Bezborodnikov. On the best polynomial approximation of functions of several variables. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1962), pp. 3-12. http://geodesic.mathdoc.fr/item/IVM_1962_4_a0/