Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1985_21_12_a7, author = {A. E. Rudenok}, title = {Limit cycles of a two-dimensional autonomous system with quadratic nonlinearities}, journal = {Differencialʹnye uravneni\^a}, pages = {2072--2082}, publisher = {mathdoc}, volume = {21}, number = {12}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1985_21_12_a7/} }
A. E. Rudenok. Limit cycles of a two-dimensional autonomous system with quadratic nonlinearities. Differencialʹnye uravneniâ, Tome 21 (1985) no. 12, pp. 2072-2082. http://geodesic.mathdoc.fr/item/DE_1985_21_12_a7/