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@article{DAN_1962_143_2_a11, author = {L. P. Shilnikov}, title = {Some instances of generation of periodic motions in $n$-space}, journal = {Doklady Akademii Nauk}, pages = {289--292}, publisher = {mathdoc}, volume = {143}, number = {2}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_143_2_a11/} }
L. P. Shilnikov. Some instances of generation of periodic motions in $n$-space. Doklady Akademii Nauk, Tome 143 (1962) no. 2, pp. 289-292. http://geodesic.mathdoc.fr/item/DAN_1962_143_2_a11/