@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/}
}