TY  - JOUR
AU  - D. L. Berman
TI  - On the impossibility of constructing a linear polynomial operator furnishing an approximation within the order of the best approximation
JO  - Doklady Akademii Nauk
PY  - 1958
SP  - 1175
EP  - 1177
VL  - 120
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1958_120_6_a0/
LA  - ru
ID  - DAN_1958_120_6_a0
ER  -