@article{DE_1974_10_11_a24,
     author = {L. S. Lavrinovich},
     title = {A certain class of differential equations with a limit cycle},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2077--2078},
     publisher = {mathdoc},
     volume = {10},
     number = {11},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_11_a24/}
}