@article{DE_1965_1_6_a3,
     author = {V. V. Korolev},
     title = {On the existence and uniqueness of a limiting cycle for many-dimensional autonomous systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {736--741},
     publisher = {mathdoc},
     volume = {1},
     number = {6},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_6_a3/}
}