Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1958_119_4_a8, author = {Chan Chi-fen}, title = {On the uniqueness of the limit cycles of some non-linear oscillation equations}, journal = {Doklady Akademii Nauk}, pages = {659--662}, publisher = {mathdoc}, volume = {119}, number = {4}, year = {1958}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1958_119_4_a8/} }
Chan Chi-fen. On the uniqueness of the limit cycles of some non-linear oscillation equations. Doklady Akademii Nauk, Tome 119 (1958) no. 4, pp. 659-662. http://geodesic.mathdoc.fr/item/DAN_1958_119_4_a8/