no. 1
Geodesics on product lorentzian manifolds
Annales de l'I.H.P. Analyse non linéaire, Tome 12 (1995) no. 1, pp. 27-60. 
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     zbl = {0839.53046},
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}
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Giannoni, F.; Masiello, A. Geodesics on product lorentzian manifolds. Annales de l'I.H.P. Analyse non linéaire, Tome 12 (1995) no. 1, pp. 27-60. http://www.numdam.org/item/AIHPC_1995__12_1_27_0/

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