@article{PPN234735015+dmdlog237, title = {\S . 202. Positive Einheiten}, booktitle = {Lehrbuch der Algebra Bd. 2}, series = {GDML\_Books}, year = {1896}, pages = {742}, url = {http://dml.mathdoc.fr/item/PPN234735015+dmdlog237} }
(éd.). §. 202. Positive Einheiten, dans Lehrbuch der Algebra Bd. 2, GDML_Books, (1896), p. 742. http://gdmltest.u-ga.fr/item/PPN234735015+dmdlog237/