@article{IVM_1964_1_a3,
     author = {V. I. Voilokov},
     title = {Periodic solutions of non-linear oscillatory systems with one degree of freedom},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {19--27},
     publisher = {mathdoc},
     number = {1},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1964_1_a3/}
}