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@article{MAN_1900__53_157974, author = {H.W. Richmond}, title = {The figure formed from six points in space of four dimensions}, journal = {Mathematische Annalen}, pages = {161--176}, publisher = {mathdoc}, volume = {53}, year = {1900}, zbl = {31.0547.02}, url = {http://geodesic.mathdoc.fr/item/MAN_1900__53_157974/} }
H.W. Richmond. The figure formed from six points in space of four dimensions. Mathematische Annalen, Tome 53 (1900), pp. 161-176. http://geodesic.mathdoc.fr/item/MAN_1900__53_157974/