TY  - JOUR
AU  - N. G. Makarov
TI  - Stability of the essential spectrum of operators close to a unitary operator
JO  - Funkcionalʹnyj analiz i ego priloženiâ
PY  - 1982
SP  - 72
EP  - 73
VL  - 16
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/FAA_1982_16_3_a15/
LA  - ru
ID  - FAA_1982_16_3_a15
ER  -