@article{PPN37649882X+dmdlog97, title = {Grundlagen der Geometrie.}, booktitle = {Geometrie Bd. 2}, series = {GDML\_Books}, year = {1968}, pages = {171}, url = {http://dml.mathdoc.fr/item/PPN37649882X+dmdlog97} }
(éd.). Grundlagen der Geometrie., dans Geometrie Bd. 2, GDML_Books, (1968), p. 171. http://gdmltest.u-ga.fr/item/PPN37649882X+dmdlog97/