@article{AIHPC_1984__1_5_401_0,
     author = {Benci, V.},
     title = {Closed geodesics for the {Jacobi} metric and periodic solutions of prescribed energy of natural hamiltonian systems},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {401--412},
     publisher = {Gauthier-Villars},
     volume = {1},
     number = {5},
     year = {1984},
     mrnumber = {779876},
     zbl = {0588.35007},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1984__1_5_401_0/}
}