@article{PPN234736674+dmdlog154, title = {\S\ 125. Die Klasseninvariante}, booktitle = {Lehrbuch der Algebra Bd. 3}, series = {GDML\_Books}, year = {1908}, pages = {457}, url = {http://dml.mathdoc.fr/item/PPN234736674+dmdlog154} }
(éd.). § 125. Die Klasseninvariante, dans Lehrbuch der Algebra Bd. 3, GDML_Books, (1908), p. 457. http://gdmltest.u-ga.fr/item/PPN234736674+dmdlog154/