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@article{DE_1985_21_5_a8, author = {G. N. Petrovskiǐ}, title = {Some theorems of the second method of {Lyapunov} for quasiflows}, journal = {Differencialʹnye uravneni\^a}, pages = {798--801}, publisher = {mathdoc}, volume = {21}, number = {5}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1985_21_5_a8/} }
G. N. Petrovskiǐ. Some theorems of the second method of Lyapunov for quasiflows. Differencialʹnye uravneniâ, Tome 21 (1985) no. 5, pp. 798-801. http://geodesic.mathdoc.fr/item/DE_1985_21_5_a8/