@book{PPN593925270, title = {Grundvorstellungen der Geometrie Theil 1}, series = {GDML\_Books}, publisher = {Vieweg}, year = {1869}, language = {de}, url = {http://dml.mathdoc.fr/item/PPN593925270} }
Müller, Eduard. Grundvorstellungen der Geometrie Theil 1. GDML_Books (1869), http://gdmltest.u-ga.fr/item/PPN593925270/