@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/}
}