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@article{TRSPY_1987_180_a48, author = {M. I. Ganzburg}, title = {A~direct and inverse theorem on approximation by polynomials on the $m$- dimensional ball}, journal = {Informatics and Automation}, pages = {91--92}, publisher = {mathdoc}, volume = {180}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a48/} }
M. I. Ganzburg. A~direct and inverse theorem on approximation by polynomials on the $m$- dimensional ball. Informatics and Automation, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 91-92. http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a48/