@article{PPN37649882X+dmdlog126, title = {Perry und seine Tendenzen.}, booktitle = {Geometrie Bd. 2}, series = {GDML\_Books}, year = {1968}, pages = {233}, url = {http://dml.mathdoc.fr/item/PPN37649882X+dmdlog126} }
(éd.). Perry und seine Tendenzen., dans Geometrie Bd. 2, GDML_Books, (1968), p. 233. http://gdmltest.u-ga.fr/item/PPN37649882X+dmdlog126/