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@article{DE_1971_7_3_a4, author = {N. N. Ladis}, title = {The structural stability of certain systems of differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {419--423}, publisher = {mathdoc}, volume = {7}, number = {3}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1971_7_3_a4/} }
N. N. Ladis. The structural stability of certain systems of differential equations. Differencialʹnye uravneniâ, Tome 7 (1971) no. 3, pp. 419-423. http://geodesic.mathdoc.fr/item/DE_1971_7_3_a4/