no. 3
Quantized charge in terms of pure geometry
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 15 (1971) no. 3, pp. 189-202. 
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     author = {von Westenholz, C.},
     title = {Quantized charge in terms of pure geometry},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {189--202},
     publisher = {Gauthier-Villars},
     volume = {15},
     number = {3},
     year = {1971},
     mrnumber = {302126},
     zbl = {0232.53030},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1971__15_3_189_0/}
}
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von Westenholz, C. Quantized charge in terms of pure geometry. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 15 (1971) no. 3, pp. 189-202. http://www.numdam.org/item/AIHPA_1971__15_3_189_0/

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