@book{PPN593047990, title = {Die gruppentheoretischen Grundlagen Bd. 1}, series = {GDML\_Books}, publisher = {Teubner}, address = {Leipzig}, year = {1897}, language = {de}, url = {http://dml.mathdoc.fr/item/PPN593047990} }
Fricke, Robert; Klein, Felix. Die gruppentheoretischen Grundlagen Bd. 1. GDML_Books (1897), http://gdmltest.u-ga.fr/item/PPN593047990/