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@article{DE_1982_18_5_a6, author = {G. S. Krechetov}, title = {Lyapunov functions for second-order autonomous systems of first and second classes}, journal = {Differencialʹnye uravneni\^a}, pages = {772--778}, publisher = {mathdoc}, volume = {18}, number = {5}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1982_18_5_a6/} }
G. S. Krechetov. Lyapunov functions for second-order autonomous systems of first and second classes. Differencialʹnye uravneniâ, Tome 18 (1982) no. 5, pp. 772-778. http://geodesic.mathdoc.fr/item/DE_1982_18_5_a6/