@article{DE_1967_3_10_a0,
     author = {E. A. Barbashin},
     title = {Conditions for the existence of recurrent trajectories in dynamic systems with a cylindrical phase space},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1627--1633},
     publisher = {mathdoc},
     volume = {3},
     number = {10},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_10_a0/}
}