1. Barutello, V. Ferrario, D.L., Terracini, S.: On the singularities of generalized solutions to $$n$$ -body-type problems. Int. Math. Res. Not. IMRN, Art. ID rnn 069 (2008)
2. Barutello, V., Terracini, S., Verzini, G.: Entire minimal parabolic trajectories: the planar anisotropic Kepler problem. Arch. Ration. Mech. Anal. (2012). doi: 10.1007/s00205-012-0565-9
3. Benci, V.: Closed geodesics for the Jacobi metric and periodic solutions of prescribed energy of natural Hamiltonian systems. Ann. Inst. H. Poincaré Anal. Non Linéaire 1, 401–412 (1984)
4. Chazy, J.: Sur certaines trajectoires du problème des n corps. Bull. Astron. 35, 321–389 (1918) (in French)
5. Chazy, J.: Sur l’allure du mouvement dans le problème de trois corps quand lle temps crois indèfinimment. Ann. Sci. Ec. Norm. Sup. 39, 29–130 (1922) (in French)