Geodesic
Perturbations of the point spectrum
Differencialʹnye uravneniâ, Tome 26 (1990) no. 1, pp. 23-30.

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     author = {A. A. Dezin},
     title = {Perturbations of the point spectrum},
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     number = {1},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_1_a3/}
}
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A. A. Dezin. Perturbations of the point spectrum. Differencialʹnye uravneniâ, Tome 26 (1990) no. 1, pp. 23-30. http://geodesic.mathdoc.fr/item/DE_1990_26_1_a3/