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@article{DE_1972_8_5_a6, author = {N. N. Ladis}, title = {Energy functions for certain dynamical systems}, journal = {Differencialʹnye uravneni\^a}, pages = {790--794}, publisher = {mathdoc}, volume = {8}, number = {5}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1972_8_5_a6/} }
N. N. Ladis. Energy functions for certain dynamical systems. Differencialʹnye uravneniâ, Tome 8 (1972) no. 5, pp. 790-794. http://geodesic.mathdoc.fr/item/DE_1972_8_5_a6/