@article{AIHPA_1977__26_3_313_0,
     author = {Niederer, U. and O'Raifeartaigh, L.},
     title = {Covariant wave-equations, the {Galilei} group, and the magnetic moment of the electron},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {313--321},
     publisher = {Gauthier-Villars},
     volume = {26},
     number = {3},
     year = {1977},
     mrnumber = {475369},
     zbl = {0351.22014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AIHPA_1977__26_3_313_0/}
}