TY  - JOUR
AU  - A. V. Kolushov
TI  - Differential properties of the operator of best approximation by rational fractions
JO  - Matematičeskie zametki
PY  - 1989
SP  - 40
EP  - 50
VL  - 45
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1989_45_2_a4/
LA  - ru
ID  - MZM_1989_45_2_a4
ER  -