TY  - JOUR
AU  - A. P. Buslaev
TI  - On best approximation of the differentiation operator
JO  - Doklady Akademii Nauk
PY  - 1979
SP  - 1041
EP  - 1044
VL  - 248
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1979_248_5_a2/
LA  - ru
ID  - DAN_1979_248_5_a2
ER  -