@article{PPN37649882X+dmdlog82, title = {I. Die Systematik.}, booktitle = {Geometrie Bd. 2}, series = {GDML\_Books}, year = {1968}, pages = {140}, url = {http://dml.mathdoc.fr/item/PPN37649882X+dmdlog82} }
(éd.). I. Die Systematik., dans Geometrie Bd. 2, GDML_Books, (1968), p. 140. http://gdmltest.u-ga.fr/item/PPN37649882X+dmdlog82/