TY  - JOUR
AU  - P. P. Korovkin
TI  - On the order of the approximation of functions by linear positive operators
JO  - Doklady Akademii Nauk
PY  - 1957
SP  - 1158
EP  - 1161
VL  - 114
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1957_114_6_a5/
LA  - ru
ID  - DAN_1957_114_6_a5
ER  -