@article{PPN517627655+dmdlog18, title = {79. Der Raum.}, booktitle = {Das Weltsystem Theil 2}, series = {GDML\_Books}, year = {1896}, pages = {34}, url = {http://dml.mathdoc.fr/item/PPN517627655+dmdlog18} }
(éd.). 79. Der Raum., dans Das Weltsystem Theil 2, GDML_Books, (1896), p. 34. http://gdmltest.u-ga.fr/item/PPN517627655+dmdlog18/