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.
@article{AIHPA_1998__69_4_359_0,
     author = {Giannoni, F. and Masiello, A. and Piccione, P.},
     title = {A {Morse} theory for light rays on stably causal lorentzian manifolds},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {359--412},
     publisher = {Gauthier-Villars},
     volume = {69},
     number = {4},
     year = {1998},
     mrnumber = {1659591},
     zbl = {0920.58019},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1998__69_4_359_0/}
}
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Giannoni, F.; Masiello, A.; Piccione, P. 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. http://www.numdam.org/item/AIHPA_1998__69_4_359_0/

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