@article{DE_1989_25_8_a6,
     author = {V. A. Sadovnichii and V. V. Dubrovskii and A. V. Nagornyi},
     title = {Asymptotics of the spectral function of a discrete operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1340--1344},
     publisher = {mathdoc},
     volume = {25},
     number = {8},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_8_a6/}
}