Infinitely many spacelike periodic trajectories on a class of Lorentz manifolds
Rendiconti del Seminario Matematico della Università di Padova, Tome 91 (1994), pp. 251-263. 
@article{RSMUP_1994__91__251_0,
     author = {Greco, Carlo},
     title = {Infinitely many spacelike periodic trajectories on a class of {Lorentz} manifolds},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {251--263},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {91},
     year = {1994},
     mrnumber = {1289640},
     zbl = {0807.53055},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1994__91__251_0/}
}
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Greco, Carlo. Infinitely many spacelike periodic trajectories on a class of Lorentz manifolds. Rendiconti del Seminario Matematico della Università di Padova, Tome 91 (1994), pp. 251-263. http://archive.numdam.org/item/RSMUP_1994__91__251_0/

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