@article{DE_1967_3_11_a9,
     author = {R. A. Shirikyan},
     title = {Asymptotic methods in the theory of one-dimensional singular differential operators of odd order},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1942--1956},
     publisher = {mathdoc},
     volume = {3},
     number = {11},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_11_a9/}
}