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@article{CMH_1929__1_138515, author = {W. Benteli}, title = {Somengeometrie und {Nicht-Euklidische} {Gemetrie.}}, journal = {Commentarii mathematici Helvetici}, pages = {42--63}, publisher = {mathdoc}, volume = {1}, year = {1929}, language = {de}, url = {http://geodesic.mathdoc.fr/item/CMH_1929__1_138515/} }
W. Benteli. Somengeometrie und Nicht-Euklidische Gemetrie.. Commentarii mathematici Helvetici, Tome 1 (1929), pp. 42-63. http://geodesic.mathdoc.fr/item/CMH_1929__1_138515/