@article{PPN234735015+dmdlog8, title = {Erstes Buch. Gruppen}, booktitle = {Lehrbuch der Algebra Bd. 2}, series = {GDML\_Books}, year = {1896}, pages = {1}, url = {http://dml.mathdoc.fr/item/PPN234735015+dmdlog8} }
(éd.). Erstes Buch. Gruppen, dans Lehrbuch der Algebra Bd. 2, GDML_Books, (1896), p. 1. http://gdmltest.u-ga.fr/item/PPN234735015+dmdlog8/