@article{DE_1984_20_11_a24,
     author = {Yu. A. Konyaev},
     title = {A general approach to asymptotic integration of singularly perturbed initial value and boundary value problems for systems of linear ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1999--2003},
     year = {1984},
     volume = {20},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_11_a24/}
}