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@article{DE_2000_36_12_a8, author = {A. P. Sadovskii}, title = {Centers and {Foci} for a {Class} of {Cubic} {Systems}}, journal = {Differencialʹnye uravneni\^a}, pages = {1652--1657}, publisher = {mathdoc}, volume = {36}, number = {12}, year = {2000}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_2000_36_12_a8/} }
A. P. Sadovskii. Centers and Foci for a Class of Cubic Systems. Differencialʹnye uravneniâ, Tome 36 (2000) no. 12, pp. 1652-1657. http://geodesic.mathdoc.fr/item/DE_2000_36_12_a8/