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@article{IVM_1987_8_a1, author = {I. B. Gontareva}, title = {On the existence of closed trajectories of structurally stable autonomous systems}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {11--13}, publisher = {mathdoc}, number = {8}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1987_8_a1/} }
I. B. Gontareva. On the existence of closed trajectories of structurally stable autonomous systems. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 8 (1987), pp. 11-13. http://geodesic.mathdoc.fr/item/IVM_1987_8_a1/