@article{DE_1984_20_12_a1,
     author = {I. M. Burkin and G. A. Leonov},
     title = {Existence of periodic solutions to a third-order nonlinear system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2036--2042},
     publisher = {mathdoc},
     volume = {20},
     number = {12},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_12_a1/}
}