@article{DE_1973_9_6_a23,
     author = {A. A. Shishkin},
     title = {Asymptotic behavior of the solutions of one-point and two-point problems with singular perturbations for systems of linear ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1156--1160},
     publisher = {mathdoc},
     volume = {9},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_6_a23/}
}