@article{PPN517627655+dmdlog8, title = {70. Vorbemerkung.}, booktitle = {Das Weltsystem Theil 2}, series = {GDML\_Books}, year = {1896}, pages = {1}, url = {http://dml.mathdoc.fr/item/PPN517627655+dmdlog8} }
(éd.). 70. Vorbemerkung., dans Das Weltsystem Theil 2, GDML_Books, (1896), p. 1. http://gdmltest.u-ga.fr/item/PPN517627655+dmdlog8/