TY  - JOUR
AU  - V. N. Gol'dberg
TI  - Perturbation of linear operators with a purely discrete spectrum
JO  - Doklady Akademii Nauk
PY  - 1957
SP  - 643
EP  - 645
VL  - 115
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1957_115_4_a1/
LA  - ru
ID  - DAN_1957_115_4_a1
ER  -