@article{IVM_1967_3_a6,
     author = {I. S. Kukles and L. V. Shakhova},
     title = {On the absence of limit cycles for a~differential equation},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {46--49},
     publisher = {mathdoc},
     number = {3},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1967_3_a6/}
}