Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1981_17_11_a15, author = {M. A. Amatov}, title = {Periodic solutions of a nonlinear system}, journal = {Differencialʹnye uravneni\^a}, pages = {2084--2085}, publisher = {mathdoc}, volume = {17}, number = {11}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1981_17_11_a15/} }
M. A. Amatov. Periodic solutions of a nonlinear system. Differencialʹnye uravneniâ, Tome 17 (1981) no. 11, pp. 2084-2085. http://geodesic.mathdoc.fr/item/DE_1981_17_11_a15/