@article{GDZPPN002232332,
title = {A geometric approach to a result of Benci and Giannoni for Hamiltonian systems with singular potentials.},
journal = {Manuscripta mathematica},
volume = {70},
year = {1991},
pages = {405-414},
zbl = {0737.58049},
url = {http://dml.mathdoc.fr/item/GDZPPN002232332}
}
Daxin, Zhu. A geometric approach to a result of Benci and Giannoni for Hamiltonian systems with singular potentials.. Manuscripta mathematica, Tome 70 (1991) pp. 405-414. http://gdmltest.u-ga.fr/item/GDZPPN002232332/