@article{PPN37649882X+dmdlog5, title = {Einleitung.}, booktitle = {Geometrie Bd. 2}, series = {GDML\_Books}, year = {1968}, pages = {1}, url = {http://dml.mathdoc.fr/item/PPN37649882X+dmdlog5} }
(éd.). Einleitung., dans Geometrie Bd. 2, GDML_Books, (1968), p. 1. http://gdmltest.u-ga.fr/item/PPN37649882X+dmdlog5/