Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1992_9_a1, author = {S. A. Vavilov and S. V. Yukhnevich}, title = {Periodic solutions of autonomous systems}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {13--15}, publisher = {mathdoc}, number = {9}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1992_9_a1/} }
S. A. Vavilov; S. V. Yukhnevich. Periodic solutions of autonomous systems. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (1992), pp. 13-15. http://geodesic.mathdoc.fr/item/IVM_1992_9_a1/