TY  - JOUR
AU  - V. F. Babenko
AU  - S. A. Pichugov
TI  - Best linear approximation of some classes of differentiable periodic functions
JO  - Matematičeskie zametki
PY  - 1980
SP  - 683
EP  - 689
VL  - 27
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1980_27_5_a1/
LA  - ru
ID  - MZM_1980_27_5_a1
ER  -