@article{FAA_1991_25_3_a10,
     author = {P. A. Kozhukhar'},
     title = {Point spectrum of singular nonselfadjoint differential operators},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {78--80},
     publisher = {mathdoc},
     volume = {25},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1991_25_3_a10/}
}