@article{DAN_1966_167_5_a10,
     author = {B. A. Shcherbakov},
     title = {Recurrent solutions of differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {1004--1007},
     year = {1966},
     volume = {167},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_167_5_a10/}
}