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@article{DE_1995_31_4_a3, author = {B. S. Kalitin}, title = {On the method of sign-constant {Lyapunov} functions for nonautonomous differential systems}, journal = {Differencialʹnye uravneni\^a}, pages = {583--590}, publisher = {mathdoc}, volume = {31}, number = {4}, year = {1995}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1995_31_4_a3/} }
B. S. Kalitin. On the method of sign-constant Lyapunov functions for nonautonomous differential systems. Differencialʹnye uravneniâ, Tome 31 (1995) no. 4, pp. 583-590. http://geodesic.mathdoc.fr/item/DE_1995_31_4_a3/