@article{DE_1990_26_3_a23,
     author = {V. V. Dubrovskii},
     title = {Asymptotics of the spectral function of an ordinary differential operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {533--534},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_3_a23/}
}