@article{AIHPA_1971__15_3_189_0,
     author = {von Westenholz, C.},
     title = {Quantized charge in terms of pure geometry},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {189--202},
     publisher = {Gauthier-Villars},
     volume = {15},
     number = {3},
     year = {1971},
     mrnumber = {302126},
     zbl = {0232.53030},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AIHPA_1971__15_3_189_0/}
}