§. 3. Normaltheiler einer Gruppe
Lehrbuch der Algebra Bd. 2, GDML_Books, (1896), p. 10 / Harvested from
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     title = {\S . 3. Normaltheiler einer Gruppe},
     booktitle = {Lehrbuch der Algebra Bd. 2},
     series = {GDML\_Books},
     year = {1896},
     pages = {10},
     url = {http://dml.mathdoc.fr/item/PPN234735015+dmdlog12}
}

 (éd.). §. 3. Normaltheiler einer Gruppe, dans Lehrbuch der Algebra Bd. 2, GDML_Books,  (1896), p. 10. http://gdmltest.u-ga.fr/item/PPN234735015+dmdlog12/