@article{PPN517627655+dmdlog6, title = {69. Gegenstand.}, booktitle = {Das Weltsystem Theil 2}, series = {GDML\_Books}, year = {1896}, pages = {1}, url = {http://dml.mathdoc.fr/item/PPN517627655+dmdlog6} }
(éd.). 69. Gegenstand., dans Das Weltsystem Theil 2, GDML_Books, (1896), p. 1. http://gdmltest.u-ga.fr/item/PPN517627655+dmdlog6/