Multiple orbits for hamiltonian systems on starshaped surfaces with symmetries
Annales de l'I.H.P. Analyse non linéaire, Tome 1 (1984) no. 4, pp. 285-294. 
@article{AIHPC_1984__1_4_285_0,
     author = {Girardi, Mario},
     title = {Multiple orbits for hamiltonian systems on starshaped surfaces with symmetries},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {285--294},
     publisher = {Gauthier-Villars},
     volume = {1},
     number = {4},
     year = {1984},
     mrnumber = {778975},
     zbl = {0582.70019},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1984__1_4_285_0/}
}
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Girardi, Mario. Multiple orbits for hamiltonian systems on starshaped surfaces with symmetries. Annales de l'I.H.P. Analyse non linéaire, Tome 1 (1984) no. 4, pp. 285-294. http://www.numdam.org/item/AIHPC_1984__1_4_285_0/

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