@article{DE_1967_3_2_a8,
     author = {G. V. Zhdanova},
     title = {On the spectrum of a non-selfadjoint {Sturm--Liouville} operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {250--263},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_2_a8/}
}