@book{PPN309767601, title = {Die Geometrie der Lage 1. Abth.}, series = {GDML\_Books}, year = {1866}, language = {ger}, url = {http://dml.mathdoc.fr/item/PPN309767601} }
(éd.). Die Geometrie der Lage 1. Abth.. GDML_Books (1866), http://gdmltest.u-ga.fr/item/PPN309767601/