List of citations in Numdam for : A Morse theory for light rays on stably causal lorentzian manifolds

Annales de l'I.H.P. Physique théorique, Volume 69 (1998) no. 4, pp. 359-412.

Caponio, Erasmo; Javaloyes, Miguel Ángel; Masiello, Antonio

Annales de l'I.H.P. Analyse non linéaire, Volume 27 (2010) no. 3, pp. 857-876.