TY  - JOUR
AU  - M. A. Gol'dman
AU  - S. N. Krachkovskii
TI  - On the stability of some properties of a closed linear operator
JO  - Doklady Akademii Nauk
PY  - 1973
SP  - 769
EP  - 772
VL  - 209
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1973_209_4_a2/
LA  - ru
ID  - DAN_1973_209_4_a2
ER  -