TY  - JOUR
AU  - V. A. Sadovnichii
AU  - V. A. Lyubishkin
TI  - Some questions of the theory of perturbations of linear operators
JO  - Differencialʹnye uravneniâ
PY  - 1981
SP  - 1911
EP  - 1914
VL  - 17
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1981_17_10_a19/
LA  - ru
ID  - DE_1981_17_10_a19
ER  -