@book{PPN591444399, title = {Die Theorie der Kegelschnitte in elementarer Darstellung Theil 1}, series = {GDML\_Books}, publisher = {Teubner}, address = {Leipzig}, year = {1875}, language = {de}, url = {http://dml.mathdoc.fr/item/PPN591444399} }
Steiner, Jacob. Die Theorie der Kegelschnitte in elementarer Darstellung Theil 1. GDML_Books (1875), http://gdmltest.u-ga.fr/item/PPN591444399/