TY  - JOUR
AU  - A. N. Davidchik
AU  - A. A. Ligun
TI  - Approximation of periodic functions by linear operators
JO  - Informatics and Automation
PY  - 1987
SP  - 98
EP  - 99
VL  - 180
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a53/
LA  - ru
ID  - TRSPY_1987_180_a53
ER  -