@article{DE_1977_13_7_a0,
     author = {Yu. M. Vahromeev and V. M. Kornev},
     title = {Boundary value problems with a small parameter for ordinary linear differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1163--1170},
     publisher = {mathdoc},
     volume = {13},
     number = {7},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_7_a0/}
}