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@article{IVM_1961_6_a1, author = {I. M. Volk}, title = {A limiting case in the theory of periodic solutions of {Lyapunov} systems.}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {8--15}, publisher = {mathdoc}, number = {6}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1961_6_a1/} }
I. M. Volk. A limiting case in the theory of periodic solutions of Lyapunov systems.. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1961), pp. 8-15. http://geodesic.mathdoc.fr/item/IVM_1961_6_a1/