@article{DE_1975_11_2_a2,
     author = {A. B. Vasil'eva},
     title = {Conditionally stable singularly perturbed systems with singularities in the boundary conditons},
     journal = {Differencialʹnye uravneni\^a},
     pages = {227--238},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_2_a2/}
}