Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1987_23_10_a26, author = {G. N. Petrovskiǐ}, title = {Theorems of the {Lyapunov} functions method for quasiflows}, journal = {Differencialʹnye uravneni\^a}, pages = {1819--1821}, publisher = {mathdoc}, volume = {23}, number = {10}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1987_23_10_a26/} }
G. N. Petrovskiǐ. Theorems of the Lyapunov functions method for quasiflows. Differencialʹnye uravneniâ, Tome 23 (1987) no. 10, pp. 1819-1821. http://geodesic.mathdoc.fr/item/DE_1987_23_10_a26/