@article{IVM_1958_2_a1,
     author = {M. I. Al'mukhamedov},
     title = {The sets of periodic motions determined by a~system of differential equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {5--16},
     publisher = {mathdoc},
     number = {2},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1958_2_a1/}
}