Geodesic
On the spectrum of a non-selfadjoint Sturm–Liouville operator
Differencialʹnye uravneniâ, Tome 3 (1967) no. 2, pp. 250-263 
G. V. Zhdanova. On the spectrum of a non-selfadjoint Sturm–Liouville operator. Differencialʹnye uravneniâ, Tome 3 (1967) no. 2, pp. 250-263. http://geodesic.mathdoc.fr/item/DE_1967_3_2_a8/
@article{DE_1967_3_2_a8,
     author = {G. V. Zhdanova},
     title = {On the spectrum of a non-selfadjoint {Sturm{\textendash}Liouville} operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {250--263},
     year = {1967},
     volume = {3},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_2_a8/}
}
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