@article{GDZPPN002259877, title = {Zur Bolyai-Lobatschefskijschen Geometrie}, journal = {Mathematische Annalen}, volume = {58}, year = {1904}, pages = {314-320}, language = {de}, url = {http://dml.mathdoc.fr/item/GDZPPN002259877} }
Schur, Friedrich. Zur Bolyai-Lobatschefskijschen Geometrie. Mathematische Annalen, Tome 58 (1904) pp. 314-320. http://gdmltest.u-ga.fr/item/GDZPPN002259877/