@book{PPN597844968, title = {Die analytische Geometrie in der Ebene Bd. 1,4}, series = {GDML\_Books}, publisher = {Dalp}, address = {Leipzig}, year = {1839}, language = {de}, url = {http://dml.mathdoc.fr/item/PPN597844968} }
Francoeur, Louis Benjamin. Die analytische Geometrie in der Ebene Bd. 1,4. GDML_Books (1839), http://gdmltest.u-ga.fr/item/PPN597844968/