Multiple closed orbits for singular conservative systems via geodesic theory
Rendiconti del Seminario Matematico della Università di Padova, Tome 85 (1991), pp. 201-215. 
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     author = {Bessi, Ugo},
     title = {Multiple closed orbits for singular conservative systems via geodesic theory},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {201--215},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {85},
     year = {1991},
     mrnumber = {1142541},
     zbl = {0850.70210},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1991__85__201_0/}
}
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Bessi, Ugo. Multiple closed orbits for singular conservative systems via geodesic theory. Rendiconti del Seminario Matematico della Università di Padova, Tome 85 (1991), pp. 201-215. http://archive.numdam.org/item/RSMUP_1991__85__201_0/

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