@book{PPN37649882X, title = {Geometrie Bd. 2}, series = {GDML\_Books}, year = {1968}, language = {ger}, url = {http://dml.mathdoc.fr/item/PPN37649882X} }
(éd.). Geometrie Bd. 2. GDML_Books (1968), http://gdmltest.u-ga.fr/item/PPN37649882X/