@article{IVM_1972_8_a0,
     author = {V. P. Babii},
     title = {The computation of periodic solutions of nonautonomous systems by the method of successive approximations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--9},
     publisher = {mathdoc},
     number = {8},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1972_8_a0/}
}