@article{GDZPPN00225784X, title = {The figure formed from six points in space of four dimensions}, journal = {Mathematische Annalen}, volume = {53}, year = {1900}, pages = {161-176}, zbl = {31.0547.02}, url = {http://dml.mathdoc.fr/item/GDZPPN00225784X} }
Richmond, H.W. The figure formed from six points in space of four dimensions. Mathematische Annalen, Tome 53 (1900) pp. 161-176. http://gdmltest.u-ga.fr/item/GDZPPN00225784X/