@article{PPN234729163+dmdlog216, title = {\S . 187. Realit\"atsverh\"altnisse}, booktitle = {Lehrbuch der Algebra Bd. 1}, series = {GDML\_Books}, year = {1895}, pages = {647}, url = {http://dml.mathdoc.fr/item/PPN234729163+dmdlog216} }
(éd.). §. 187. Realitätsverhältnisse, dans Lehrbuch der Algebra Bd. 1, GDML_Books, (1895), p. 647. http://gdmltest.u-ga.fr/item/PPN234729163+dmdlog216/