@article{05637357,
title = {Periodic solution of second-order Hamiltonian systems with a change sign potential on time scales.},
journal = {Discrete Dynamics in Nature and Society},
volume = {2009},
year = {2009},
doi = {10.1155/2009/328479},
zbl = {1182.34118},
language = {en},
url = {http://dml.mathdoc.fr/item/05637357}
}
Su, You-Hui; Li, Wan-Tong. Periodic solution of second-order Hamiltonian systems with a change sign potential on time scales.. Discrete Dynamics in Nature and Society, Tome 2009 (2009) . doi : 10.1155/2009/328479. http://gdmltest.u-ga.fr/item/05637357/