@article{IVM_2002_6_a9,
     author = {M. T. Terekhin},
     title = {Nonzero periodic solutions of a~nonautonomous system of ordinary differential equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {63--68},
     publisher = {mathdoc},
     number = {6},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2002_6_a9/}
}