@article{DE_1992_28_9_a21,
     author = {Yu. V. Malyshev and V. P. Zakharov},
     title = {Detection of a limit cycle in the {Li\'enard} equation by means of generalized {Lyapunov} functions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1635--1638},
     publisher = {mathdoc},
     volume = {28},
     number = {9},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_9_a21/}
}