@article{DAN_1958_119_3_a13,
     author = {V. Solonnikov},
     title = {Linear differential equations with a small parameter in the highest derivative term},
     journal = {Doklady Akademii Nauk},
     pages = {454--457},
     publisher = {mathdoc},
     volume = {119},
     number = {3},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_119_3_a13/}
}