TY  - JOUR
AU  - V. N. Pyvovarchyk
TI  - Closedness of the approximate spectrum of a~polynomial operator pencil
JO  - Matematičeskie zametki
PY  - 1990
SP  - 147
EP  - 148
VL  - 47
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1990_47_6_a21/
LA  - ru
ID  - MZM_1990_47_6_a21
ER  -