Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1983_19_11_a2, author = {I. V. Kamenev}, title = {Periodic solutions of first-order differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {1853--1859}, publisher = {mathdoc}, volume = {19}, number = {11}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1983_19_11_a2/} }
I. V. Kamenev. Periodic solutions of first-order differential equations. Differencialʹnye uravneniâ, Tome 19 (1983) no. 11, pp. 1853-1859. http://geodesic.mathdoc.fr/item/DE_1983_19_11_a2/