@article{PPN517627655+dmdlog43, title = {104. Der Schwerpunkt.}, booktitle = {Das Weltsystem Theil 2}, series = {GDML\_Books}, year = {1896}, pages = {183}, url = {http://dml.mathdoc.fr/item/PPN517627655+dmdlog43} }
(éd.). 104. Der Schwerpunkt., dans Das Weltsystem Theil 2, GDML_Books, (1896), p. 183. http://gdmltest.u-ga.fr/item/PPN517627655+dmdlog43/