@article{GDZPPN002437198,
title = {Periodic Solutions of Superquadratic Hamiltonian Systems with Bounded Forcing Terms.},
journal = {Mathematische Zeitschrift},
volume = {205},
year = {1990},
pages = {453-468},
zbl = {0666.34045},
url = {http://dml.mathdoc.fr/item/GDZPPN002437198}
}
Long, Yiming. Periodic Solutions of Superquadratic Hamiltonian Systems with Bounded Forcing Terms.. Mathematische Zeitschrift, Tome 205 (1990) pp. 453-468. http://gdmltest.u-ga.fr/item/GDZPPN002437198/