@article{DE_1967_3_9_a3,
     author = {B. A. Shcherbakov},
     title = {Recurrent solutions of differential equations and the general theory of dynamical systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1450--1460},
     publisher = {mathdoc},
     volume = {3},
     number = {9},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_9_a3/}
}