@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'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {201--216},
     publisher = {Gauthier-Villars},
     volume = {22},
     number = {3},
     year = {1975},
     mrnumber = {385766},
     zbl = {0306.53026},
     language = {fr},
     url = {http://www.numdam.org/item/AIHPA_1975__22_3_201_0/}
}