@article{DE_1986_22_7_a21,
     author = {V. G. Prikazchikov},
     title = {Steepest descent in a spectral problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1268--1271},
     publisher = {mathdoc},
     volume = {22},
     number = {7},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_7_a21/}
}