Geodesic
On the best approximation of functions of several variables by means of polynomials or trigonometric sums
Informatics and Automation, Trudy Matematicheskogo Instituta imeni V. A. Steklova, Tome 38 (1951), pp. 24-29.

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     author = {S. N. Bernshtein},
     title = {On the best approximation of functions of several variables by means of polynomials or trigonometric sums},
     journal = {Informatics and Automation},
     pages = {24--29},
     publisher = {mathdoc},
     volume = {38},
     year = {1951},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1951_38_a2/}
}
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S. N. Bernshtein. On the best approximation of functions of several variables by means of polynomials or trigonometric sums. Informatics and Automation, Trudy Matematicheskogo Instituta imeni V. A. Steklova, Tome 38 (1951), pp. 24-29. http://geodesic.mathdoc.fr/item/TRSPY_1951_38_a2/