TY  - JOUR
AU  - D. L. Berman
TI  - Extremal problems in the theory of polynomial operators (non-periodic case)
JO  - Doklady Akademii Nauk
PY  - 1961
SP  - 519
EP  - 521
VL  - 140
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1961_140_3_a0/
LA  - ru
ID  - DAN_1961_140_3_a0
ER  -