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@article{IVM_1959_1_a4, author = {I. M. Volk}, title = {On the limit cycle of a~dynamical system of differential equations in a~class of cases}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {35--44}, publisher = {mathdoc}, number = {1}, year = {1959}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1959_1_a4/} }
I. M. Volk. On the limit cycle of a~dynamical system of differential equations in a~class of cases. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1959), pp. 35-44. http://geodesic.mathdoc.fr/item/IVM_1959_1_a4/