Geodesic
Stability of the essential spectrum of operators close to a unitary operator
Funkcionalʹnyj analiz i ego priloženiâ, Tome 16 (1982) no. 3, pp. 72-73.

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N. G. Makarov. Stability of the essential spectrum of operators close to a unitary operator. Funkcionalʹnyj analiz i ego priloženiâ, Tome 16 (1982) no. 3, pp. 72-73. http://geodesic.mathdoc.fr/item/FAA_1982_16_3_a15/

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