@article{urn:eudml:doc:39529, title = {Multiple periodic solutions of some forced hamiltonian systems and the generalized saddle point theorem.}, journal = {Collectanea Mathematica}, volume = {43}, year = {1992}, pages = {217-224}, zbl = {0795.58041}, mrnumber = {MR1252731}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:39529} }
Timoumi, Mohsen. Multiple periodic solutions of some forced hamiltonian systems and the generalized saddle point theorem.. Collectanea Mathematica, Tome 43 (1992) pp. 217-224. http://gdmltest.u-ga.fr/item/urn:eudml:doc:39529/