@article{DAN_1957_112_6_a4,
     author = {N. N. Molchanov},
     title = {The use of the theory of continuous groups of transformations in investigating the solutions of ordinary},
     journal = {Doklady Akademii Nauk},
     pages = {998--1001},
     year = {1957},
     volume = {112},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_112_6_a4/}
}