@article{1028998769, author = {Lakshmikantham, V.}, title = {Differential systems and extension of Lyapunov's method.}, journal = {Michigan Math. J.}, volume = {9}, number = {1}, year = {1962}, pages = { 311-320}, language = {en}, url = {http://dml.mathdoc.fr/item/1028998769} }
Lakshmikantham, V. Differential systems and extension of Lyapunov's method.. Michigan Math. J., Tome 9 (1962) no. 1, pp. 311-320. http://gdmltest.u-ga.fr/item/1028998769/