@article{DE_1977_13_4_a18,
     author = {A. B. Vasil'eva and M. V. Faminskaya},
     title = {A boundary value problem for singularly perturbed differential and difference systems when the unperturbed system lies on the spectrum},
     journal = {Differencialʹnye uravneni\^a},
     pages = {738--742},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_4_a18/}
}