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@article{IVM_1965_2_a11, author = {N. V. Medvedev}, title = {On conditions for the uniqueness of a limit cycle}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {99--103}, publisher = {mathdoc}, number = {2}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1965_2_a11/} }
N. V. Medvedev. On conditions for the uniqueness of a limit cycle. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1965), pp. 99-103. http://geodesic.mathdoc.fr/item/IVM_1965_2_a11/