@article{IVM_1968_8_a12,
     author = {S. M. Shaova},
     title = {The cycles of a~certain differential equation},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {96--102},
     publisher = {mathdoc},
     number = {8},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1968_8_a12/}
}