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@article{DE_1969_5_9_a1, author = {V. V. Nemytskii and Yu. V. Malyshev}, title = {A qualitative investigation of potential systems}, journal = {Differencialʹnye uravneni\^a}, pages = {1550--1557}, publisher = {mathdoc}, volume = {5}, number = {9}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1969_5_9_a1/} }
V. V. Nemytskii; Yu. V. Malyshev. A qualitative investigation of potential systems. Differencialʹnye uravneniâ, Tome 5 (1969) no. 9, pp. 1550-1557. http://geodesic.mathdoc.fr/item/DE_1969_5_9_a1/