Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1970_194_3_a7, author = {\`E. Muhamadiev}, title = {On the theory of periodic solutions of systems of ordinary differential equations}, journal = {Doklady Akademii Nauk}, pages = {510--513}, publisher = {mathdoc}, volume = {194}, number = {3}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1970_194_3_a7/} }
È. Muhamadiev. On the theory of periodic solutions of systems of ordinary differential equations. Doklady Akademii Nauk, Tome 194 (1970) no. 3, pp. 510-513. http://geodesic.mathdoc.fr/item/DAN_1970_194_3_a7/