@article{DE_1965_1_10_a4,
     author = {Yu. D. Salmanov},
     title = {Sturm{\textendash}Liouville problem for a certain general linear differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1321--1337},
     year = {1965},
     volume = {1},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_10_a4/}
}