@article{02163630, title = {Three periodic solutions to an eigenvalue problem for a class of second-order Hamiltonian systems.}, journal = {Abstract and Applied Analysis}, volume = {2003}, year = {2003}, pages = {1037-1045}, doi = {10.1155/S1085337503305044}, zbl = {1093.34019}, language = {en}, url = {http://dml.mathdoc.fr/item/02163630} }
Cordaro, Giuseppe. Three periodic solutions to an eigenvalue problem for a class of second-order Hamiltonian systems.. Abstract and Applied Analysis, Tome 2003 (2003) pp. 1037-1045. doi : 10.1155/S1085337503305044. http://gdmltest.u-ga.fr/item/02163630/