@article{PPN592509036+DMDLOG_0009, title = {Sechster Abschnitt.}, booktitle = {Planimetrie Theil 2}, series = {GDML\_Books}, publisher = {Hirt}, address = {Breslau}, year = {1877}, pages = {74}, url = {http://dml.mathdoc.fr/item/PPN592509036+DMDLOG_0009} }
(éd.). Sechster Abschnitt., dans Planimetrie Theil 2, GDML_Books, (1877), p. 74. http://gdmltest.u-ga.fr/item/PPN592509036+DMDLOG_0009/