@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/