@article{01751590, title = {Periodic solutions of a class of non-autonomous second-order differential inclusion systems.}, journal = {Abstract and Applied Analysis}, volume = {6}, year = {2001}, pages = {151-161}, doi = {10.1155/S1085337501000525}, zbl = {1008.34033}, language = {en}, url = {http://dml.mathdoc.fr/item/01751590} }
Paşca, Daniel. Periodic solutions of a class of non-autonomous second-order differential inclusion systems.. Abstract and Applied Analysis, Tome 6 (2001) pp. 151-161. doi : 10.1155/S1085337501000525. http://gdmltest.u-ga.fr/item/01751590/