@article{PPN593925297+DMDLOG_0014, title = {Viertes Capitel.}, booktitle = {Geometrische Formenlehre Theil 2}, series = {GDML\_Books}, publisher = {Vieweg}, year = {1869}, pages = {63}, url = {http://dml.mathdoc.fr/item/PPN593925297+DMDLOG_0014} }
(éd.). Viertes Capitel., dans Geometrische Formenlehre Theil 2, GDML_Books, (1869), p. 63. http://gdmltest.u-ga.fr/item/PPN593925297+DMDLOG_0014/