Geodesic
Some questions of the theory of perturbations of linear operators
Differencialʹnye uravneniâ, Tome 17 (1981) no. 10, pp. 1911-1914 
V. A. Sadovnichii; V. A. Lyubishkin. Some questions of the theory of perturbations of linear operators. Differencialʹnye uravneniâ, Tome 17 (1981) no. 10, pp. 1911-1914. http://geodesic.mathdoc.fr/item/DE_1981_17_10_a19/
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     author = {V. A. Sadovnichii and V. A. Lyubishkin},
     title = {Some questions of the theory of perturbations of linear operators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1911--1914},
     year = {1981},
     volume = {17},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_10_a19/}
}
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