@article{GDZPPN002083469, title = {Die vierte Dimension.}, journal = {Elemente der Mathematik}, volume = {50}, year = {1995}, pages = {107-115}, zbl = {0859.57021}, url = {http://dml.mathdoc.fr/item/GDZPPN002083469} }
Okonek, Christian. Die vierte Dimension.. Elemente der Mathematik, Tome 50 (1995) pp. 107-115. http://gdmltest.u-ga.fr/item/GDZPPN002083469/