TY  - JOUR
AU  - S. M. Nikol'skii
TI  - Approximations of periodic functions by trigonometrical polynomials
JO  - Informatics and Automation
PY  - 1945
SP  - 3
EP  - 76
VL  - 15
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TRSPY_1945_15_a0/
LA  - ru
ID  - TRSPY_1945_15_a0
ER  -