TY  - JOUR
AU  - A. V. Kolushov
TI  - Differential properties of the operator of best approximation of continuous functions by rational fractions
JO  - Matematičeskie zametki
PY  - 1987
SP  - 654
EP  - 672
VL  - 41
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1987_41_5_a3/
LA  - ru
ID  - MZM_1987_41_5_a3
ER  -