@article{GDZPPN002203022,
title = {A class of Hamiltonian systems with increasing periods.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {358},
year = {1985},
pages = {96-109},
zbl = {0565.34037},
url = {http://dml.mathdoc.fr/item/GDZPPN002203022}
}
Schaaf, Renate. A class of Hamiltonian systems with increasing periods.. Journal für die reine und angewandte Mathematik, Tome 358 (1985) pp. 96-109. http://gdmltest.u-ga.fr/item/GDZPPN002203022/