TY - JOUR AU - Bessi, Ugo TI - Multiple closed orbits for singular conservative systems via geodesic theory JO - Rendiconti del Seminario Matematico della Università di Padova PY - 1991 DA - 1991/// SP - 201 EP - 215 VL - 85 PB - Seminario Matematico of the University of Padua UR - http://www.numdam.org/item/RSMUP_1991__85__201_0/ UR - https://zbmath.org/?q=an%3A0850.70210 UR - https://www.ams.org/mathscinet-getitem?mr=1142541 LA - en ID - RSMUP_1991__85__201_0 ER -