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@article{DE_1983_19_4_a30, author = {S. M. Shaova}, title = {Cycles of a differential equation with polynomials of the third degree}, journal = {Differencialʹnye uravneni\^a}, pages = {720--722}, publisher = {mathdoc}, volume = {19}, number = {4}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1983_19_4_a30/} }
S. M. Shaova. Cycles of a differential equation with polynomials of the third degree. Differencialʹnye uravneniâ, Tome 19 (1983) no. 4, pp. 720-722. http://geodesic.mathdoc.fr/item/DE_1983_19_4_a30/