@article{AIHPC_2000__17_1_1_0,
     author = {Tanaka, Kazunaga},
     title = {Periodic solutions for singular hamiltonian systems and closed geodesics on non-compact riemannian manifolds},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {1--33},
     publisher = {Gauthier-Villars},
     volume = {17},
     number = {1},
     year = {2000},
     mrnumber = {1743429},
     zbl = {0955.37040},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_2000__17_1_1_0/}
}