@book{PPN592284433, title = {Analytische Geometrie Bd. 3, Abth. 2}, series = {GDML\_Books}, publisher = {Hahn}, year = {1886}, language = {de}, url = {http://dml.mathdoc.fr/item/PPN592284433} }
Wittstein, Theodor. Analytische Geometrie Bd. 3, Abth. 2. GDML_Books (1886), http://gdmltest.u-ga.fr/item/PPN592284433/