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@article{DE_1980_16_2_a23, author = {V. E. Chernyshev}, title = {Closed trajectories in the neighborhood of an invariant torus}, journal = {Differencialʹnye uravneni\^a}, pages = {374--376}, publisher = {mathdoc}, volume = {16}, number = {2}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1980_16_2_a23/} }
V. E. Chernyshev. Closed trajectories in the neighborhood of an invariant torus. Differencialʹnye uravneniâ, Tome 16 (1980) no. 2, pp. 374-376. http://geodesic.mathdoc.fr/item/DE_1980_16_2_a23/