TY  - JOUR
AU  - V. A. Levin
TI  - Approximation of differentiable functions by positive methods of summation of Fourier series
JO  - Matematičeskie zametki
PY  - 1983
SP  - 515
EP  - 519
VL  - 34
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1983_34_4_a3/
LA  - ru
ID  - MZM_1983_34_4_a3
ER  -