@article{DE_1989_25_2_a10,
     author = {V. A. Sobolev and K. I. Chernyshov},
     title = {A singularly perturbed differential equation with a {Fredholm} operator multiplying the derivative},
     journal = {Differencialʹnye uravneni\^a},
     pages = {247--258},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_2_a10/}
}