TY  - JOUR
AU  - Yu. Sh. Abramov
TI  - Numerical ranges, zones, and spectra of families of selfadjoint operators
JO  - Doklady Akademii Nauk
PY  - 1981
SP  - 1033
EP  - 1037
VL  - 257
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1981_257_5_a0/
LA  - ru
ID  - DAN_1981_257_5_a0
ER  -