TY  - JOUR
AU  - V. V. Kovtunets
TI  - Differential properties of an operator of best approximation of complex-valued functions
JO  - Informatics and Automation
PY  - 1987
SP  - 135
EP  - 136
VL  - 180
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a76/
LA  - ru
ID  - TRSPY_1987_180_a76
ER  -