@article{DE_1987_23_4_a23,
     author = {Yu. V. Malyshev and V. P. Zakharov},
     title = {Lyapunov functions and self-induced oscillations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {722--724},
     publisher = {mathdoc},
     volume = {23},
     number = {4},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_4_a23/}
}