@article{AIHPA_1979__30_3_231_0,
     author = {Bray, M.},
     title = {Groupes conformes en relativit\'e g\'en\'erale},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {231--250},
     publisher = {Gauthier-Villars},
     volume = {30},
     number = {3},
     year = {1979},
     mrnumber = {546189},
     zbl = {0418.76097},
     language = {fr},
     url = {http://www.numdam.org/item/AIHPA_1979__30_3_231_0/}
}