@article{DE_1968_4_9_a14,
     author = {G. I. Bass},
     title = {Asymptotics of the spectral function of ordinary differential operators on a finite interval},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1683--1690},
     publisher = {mathdoc},
     volume = {4},
     number = {9},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_9_a14/}
}