Geodesic
On the spectrum of normal operators and perturbations of them
Doklady Akademii Nauk, Tome 158 (1964) no. 5, pp. 1042-1043.

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     author = {Karl-Peter Hadeler},
     title = {On the spectrum of normal operators and perturbations of them},
     journal = {Doklady Akademii Nauk},
     pages = {1042--1043},
     publisher = {mathdoc},
     volume = {158},
     number = {5},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_158_5_a9/}
}
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Karl-Peter Hadeler. On the spectrum of normal operators and perturbations of them. Doklady Akademii Nauk, Tome 158 (1964) no. 5, pp. 1042-1043. http://geodesic.mathdoc.fr/item/DAN_1964_158_5_a9/