@article{PPN593925270+DMDLOG_0002, title = {Vorwort.}, booktitle = {Grundvorstellungen der Geometrie Theil 1}, series = {GDML\_Books}, publisher = {Vieweg}, year = {1869}, pages = {uncounted}, url = {http://dml.mathdoc.fr/item/PPN593925270+DMDLOG_0002} }
(éd.). Vorwort., dans Grundvorstellungen der Geometrie Theil 1, GDML_Books, (1869), p. uncounted. http://gdmltest.u-ga.fr/item/PPN593925270+DMDLOG_0002/