og on ales ▁et ▁les ▁divisions ▁rég uli ères ▁de ▁l ' es pace , ▁Ann ales ▁Scient if iques ▁de ▁l ' É cole ▁Norm ale ▁Sup érieure , ▁S ér . ▁ 3 , ▁ 6 , ▁( pp .   9 – 1 0 2 , ▁pp .   8 0 – 8 1 ▁t etra hed ra ), ▁G ours at ▁t etra hed ron ▁▁ 1 9 5 1 , ▁A . ▁C . ▁Hur ley , ▁Fin ite ▁rotation ▁groups ▁and ▁cry stal ▁classes ▁in ▁four ▁dimensions , ▁Pro ceed ings ▁of ▁the ▁Cambridge ▁Philosoph ical ▁Society , ▁vol . ▁ 4 7 , ▁issue ▁ 0 4 , ▁p .   6 5 0 ▁▁ 1 9 6 2 ▁A . ▁L . ▁Mac K ay ▁Bra va is ▁L att ices ▁in ▁Four - dimensional ▁Space ▁▁ 1 9 6 4 ▁Patrick ▁du ▁Val , ▁Hom ograph ies , ▁qu atern ions ▁and ▁rot ations , ▁qu atern ion - based ▁ 4 D ▁point ▁groups ▁▁ 1 9 7 5 ▁Jan ▁Moz rz ym as , ▁And r zej ▁So le cki , ▁R 4 ▁point ▁groups , ▁Re ports ▁on ▁Mathemat ical ▁Physics , ▁Volume ▁ 7 , ▁Issue ▁ 3 , ▁p .   3 6 3 - 3 9 4 ▁▁▁ 1 9 7 8 ▁H . ▁Brown , ▁R . ▁Bü low , ▁J . ▁Ne ub ü ser , ▁H . ▁W ond rat sch ek ▁and ▁H .