@article{AIHPA_1975__22_3_201_0,
     author = {Rosca, R. and Vanhecke, L.},
     title = {Sur les vari\'et\'es lorentziennes munies d'une connexion principale},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {201--216},
     publisher = {Gauthier-Villars},
     volume = {22},
     number = {3},
     year = {1975},
     mrnumber = {385766},
     zbl = {0306.53026},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/AIHPA_1975__22_3_201_0/}
}