Geodesic
Nonselfadjoint abstract differential operators with discrete spectrum
Differencialʹnye uravneniâ, Tome 9 (1973) no. 9, pp. 1601-1608 
A. N. Kochubei. Nonselfadjoint abstract differential operators with discrete spectrum. Differencialʹnye uravneniâ, Tome 9 (1973) no. 9, pp. 1601-1608. http://geodesic.mathdoc.fr/item/DE_1973_9_9_a5/
@article{DE_1973_9_9_a5,
     author = {A. N. Kochubei},
     title = {Nonselfadjoint abstract differential operators with discrete spectrum},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1601--1608},
     year = {1973},
     volume = {9},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_9_a5/}
}
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