Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1947__20_138929, author = {Hans Georg Haefeli}, title = {Hyperkomplexe {Differentiale.}}, journal = {Commentarii mathematici Helvetici}, pages = {382--420}, publisher = {mathdoc}, volume = {20}, year = {1947}, zbl = {0035.05801}, url = {http://geodesic.mathdoc.fr/item/CMH_1947__20_138929/} }
Hans Georg Haefeli. Hyperkomplexe Differentiale.. Commentarii mathematici Helvetici, Tome 20 (1947), pp. 382-420. http://geodesic.mathdoc.fr/item/CMH_1947__20_138929/