Closed orbits of fixed energy for a class of N-body problems
Annales de l'I.H.P. Analyse non linéaire, Tome 9 (1992) no. 2, pp. 187-200.
complété par Addendum to closed orbits of fixed energy for a class of N-body problems 
@article{AIHPC_1992__9_2_187_0,
     author = {Ambrosetti, A. and Coti-Zelati, V.},
     title = {Closed orbits of fixed energy for a class of {N-body} problems},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {187--200},
     publisher = {Gauthier-Villars},
     volume = {9},
     number = {2},
     year = {1992},
     mrnumber = {1160848},
     zbl = {0757.70007},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1992__9_2_187_0/}
}
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Ambrosetti, A.; Coti-Zelati, V. Closed orbits of fixed energy for a class of N-body problems. Annales de l'I.H.P. Analyse non linéaire, Tome 9 (1992) no. 2, pp. 187-200. http://www.numdam.org/item/AIHPC_1992__9_2_187_0/

[1] A. Ambrosetti and V. Coti Zelati, Closed Orbits of Fixed Energy for Singular Hamiltonian Systems, Archive Rat. Mech. Analysis, Vol. 112, 1990, pp. 339-362. | MR | Zbl

[2] A. Ambrosetti and P.H. Rabinowitz, Dual Variational Methods in Critical Point Theory and Applications, J. Funct. Analysis, Vol. 14, 1973, pp. 349-381. | MR | Zbl

[3] A. Bahri and P.H. Rabinowitz, Solutions of the Three-Body Problem via Critical Points at Infinity, preprint.

[4] U. Bessi and V. Coti ZELATI, Symmetries and Non-Collision Closed Orbits for Planar N-Body Type Problems, J. Nonlin. Analysis TMA (to appear). | Zbl

[5] V. Coti Zelati, Periodic Solutions for N-Body Type Problems, Ann. Inst. H. Poincaré Anal. Nonlinéaire, Vol. 7-5, 1990, pp. 477-492. | Numdam | MR | Zbl