@article{DE_1987_23_11_a1,
     author = {T. R. Gichev},
     title = {A singularly perturbed linear system in a critical case},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1851--1861},
     publisher = {mathdoc},
     volume = {23},
     number = {11},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_11_a1/}
}