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

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@article{TM_1951_38_a2,
     author = {S. N. Bernshtein},
     title = {On the best approximation of functions of several variables by means of polynomials or trigonometric sums},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {24--29},
     publisher = {mathdoc},
     volume = {38},
     year = {1951},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_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. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Trudy Matematicheskogo Instituta imeni V. A. Steklova, Tome 38 (1951), pp. 24-29. http://geodesic.mathdoc.fr/item/TM_1951_38_a2/