TY  - JOUR
AU  - S. N. Bernshtein
TI  - On the best approximation of functions of several variables by means of polynomials or trigonometric sums
JO  - Informatics and Automation
PY  - 1951
SP  - 24
EP  - 29
VL  - 38
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TRSPY_1951_38_a2/
LA  - ru
ID  - TRSPY_1951_38_a2
ER  -