@article{RSMUP_1991__85__201_0, author = {Bessi, Ugo}, title = {Multiple closed orbits for singular conservative systems via geodesic theory}, journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova}, volume = {86}, year = {1991}, pages = {201-215}, mrnumber = {1142541}, zbl = {0850.70210}, language = {en}, url = {http://dml.mathdoc.fr/item/RSMUP_1991__85__201_0} }
Bessi, Ugo. Multiple closed orbits for singular conservative systems via geodesic theory. Rendiconti del Seminario Matematico della Università di Padova, Tome 86 (1991) pp. 201-215. http://gdmltest.u-ga.fr/item/RSMUP_1991__85__201_0/
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