@article{IVM_1966_1_a7,
     author = {A. A. Il'in},
     title = {On the question of finding the limiting cycles of an autonomous system of differential equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {64--65},
     publisher = {mathdoc},
     number = {1},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1966_1_a7/}
}