@article{PPN37649882X+dmdlog139, title = {Die Peanosche Schule.}, booktitle = {Geometrie Bd. 2}, series = {GDML\_Books}, year = {1968}, pages = {248}, url = {http://dml.mathdoc.fr/item/PPN37649882X+dmdlog139} }
(éd.). Die Peanosche Schule., dans Geometrie Bd. 2, GDML_Books, (1968), p. 248. http://gdmltest.u-ga.fr/item/PPN37649882X+dmdlog139/