@article{IVM_1976_3_a1,
     author = {V. P. Babii},
     title = {The computation of the subharmonics of nonautonomous systems},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {13--17},
     publisher = {mathdoc},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1976_3_a1/}
}