TY  - JOUR
AU  - M. F. Timan
TI  - The best approximation of periodic functions by trigonometric polynomials, and transforms of convolution type
JO  - Doklady Akademii Nauk
PY  - 1971
SP  - 776
EP  - 778
VL  - 198
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1971_198_4_a9/
LA  - ru
ID  - DAN_1971_198_4_a9
ER  -