@article{GDZPPN002050641,
title = {Somengeometrie und Nicht-Euklidische Gemetrie.},
journal = {Commentarii mathematici Helvetici},
volume = {1},
year = {1929},
pages = {42-63},
language = {de},
url = {http://dml.mathdoc.fr/item/GDZPPN002050641}
}
Benteli, W. Somengeometrie und Nicht-Euklidische Gemetrie.. Commentarii mathematici Helvetici, Tome 1 (1929) pp. 42-63. http://gdmltest.u-ga.fr/item/GDZPPN002050641/