@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/}
}