@article{DAN_1962_142_4_a5,
     author = {A. B. Vasil'eva},
     title = {Asymptotic formulas for the solutions of ordinary differential equations with a small parameter on the highest derivative,},
     journal = {Doklady Akademii Nauk},
     pages = {769--772},
     year = {1962},
     volume = {142},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_142_4_a5/}
}