@book{PPN602298288, title = {De Lineis Secundi Ordinis sive de Sectionibus Conicis Pars 3}, series = {GDML\_Books}, publisher = {Trattner}, address = {Vindobonae}, year = {1771}, language = {la}, url = {http://dml.mathdoc.fr/item/PPN602298288} }
Scherffer, Karl. De Lineis Secundi Ordinis sive de Sectionibus Conicis Pars 3. GDML_Books (1771), http://gdmltest.u-ga.fr/item/PPN602298288/