@article{AIHPA_1968__8_3_301_0,
     author = {Richard, J. L.},
     title = {Possible derivation of some $SO(p, q)$ group representations by means of a canonical realization of the $SO(p, q)$ {Lie} algebra},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {301--309},
     publisher = {Gauthier-Villars},
     volume = {8},
     number = {3},
     year = {1968},
     zbl = {0161.23705},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1968__8_3_301_0/}
}