@article{DE_1987_23_3_a26,
     author = {G. N. Petrovskiǐ},
     title = {On the detection of instability of quasi flows by means of generalized characteristic {Lyapunov} numbers},
     journal = {Differencialʹnye uravneni\^a},
     pages = {527--528},
     publisher = {mathdoc},
     volume = {23},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_3_a26/}
}