Perturbation of the spectra of operators of a certain class
Matematičeskie zametki, Tome 49 (1991) no. 3, pp. 149-151.

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     author = {M. I. Gil'},
     title = {Perturbation of the spectra of operators of a certain class},
     journal = {Matemati\v{c}eskie zametki},
     pages = {149--151},
     publisher = {mathdoc},
     volume = {49},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1991_49_3_a21/}
}
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M. I. Gil'. Perturbation of the spectra of operators of a certain class. Matematičeskie zametki, Tome 49 (1991) no. 3, pp. 149-151. http://geodesic.mathdoc.fr/item/MZM_1991_49_3_a21/