TY  - JOUR
AU  - M. A. Gol'dman
AU  - S. N. Krachkovskii
TI  - On certain perturbations of a closed linear operator
JO  - Doklady Akademii Nauk
PY  - 1964
SP  - 507
EP  - 509
VL  - 158
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1964_158_3_a1/
LA  - ru
ID  - DAN_1964_158_3_a1
ER  -