@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/