TY  - JOUR
AU  - A. A. Ligun
TI  - Exact constants of approximation for differentiable periodic functions
JO  - Matematičeskie zametki
PY  - 1973
SP  - 21
EP  - 30
VL  - 14
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1973_14_1_a2/
LA  - ru
ID  - MZM_1973_14_1_a2
ER  -