@article{DE_1966_2_1_a3,
     author = {T. I. Zelenyak},
     title = {Asymptotic solution of a mixed problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {47--64},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1966_2_1_a3/}
}