@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/