Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1973_9_7_a12, author = {V. F. Filiptsov}, title = {Algebraic limit cycles}, journal = {Differencialʹnye uravneni\^a}, pages = {1281--1288}, publisher = {mathdoc}, volume = {9}, number = {7}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1973_9_7_a12/} }
V. F. Filiptsov. Algebraic limit cycles. Differencialʹnye uravneniâ, Tome 9 (1973) no. 7, pp. 1281-1288. http://geodesic.mathdoc.fr/item/DE_1973_9_7_a12/