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@article{DE_1993_29_4_a21, author = {A. S. Shube}, title = {On the {Kukles} and {Cherkas} center conditions for a cubic system}, journal = {Differencialʹnye uravneni\^a}, pages = {728--730}, publisher = {mathdoc}, volume = {29}, number = {4}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1993_29_4_a21/} }
A. S. Shube. On the Kukles and Cherkas center conditions for a cubic system. Differencialʹnye uravneniâ, Tome 29 (1993) no. 4, pp. 728-730. http://geodesic.mathdoc.fr/item/DE_1993_29_4_a21/