@article{AIHPA_1967__7_4_333_0,
     author = {Bacry, H. and Nuyts, J.},
     title = {Sur des groupes de sym\'etrie pour multiplets de particules de masses diff\'erentes},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {333--338},
     publisher = {Gauthier-Villars},
     volume = {7},
     number = {4},
     year = {1967},
     zbl = {0173.30105},
     language = {fr},
     url = {http://www.numdam.org/item/AIHPA_1967__7_4_333_0/}
}