Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1967_3_10_a1, author = {A. F. Filippov}, title = {Dissipativity and periodic solutions of second order nonsymmetric systems}, journal = {Differencialʹnye uravneni\^a}, pages = {1634--1642}, publisher = {mathdoc}, volume = {3}, number = {10}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1967_3_10_a1/} }
A. F. Filippov. Dissipativity and periodic solutions of second order nonsymmetric systems. Differencialʹnye uravneniâ, Tome 3 (1967) no. 10, pp. 1634-1642. http://geodesic.mathdoc.fr/item/DE_1967_3_10_a1/