ation , ▁University ▁of ▁Toronto , ▁ 1 9 6 6 ▁ ▁N . W . ▁Johnson : ▁Ge omet ries ▁and ▁Trans form ations , ▁( 2 0 1 8 ) ▁ ▁Chapter ▁ 1 1 : ▁Fin ite ▁Sym met ry ▁Gr oups , ▁ 1 1 . 5 ▁S pher ical ▁C ox eter ▁groups , ▁p . 2 4 9 ▁ ▁John ▁H . ▁Con way ▁and ▁D erek ▁A . ▁Smith , ▁On ▁Qu atern ions ▁and ▁Oct on ions , ▁ 2 0 0 3 , ▁▁ ▁John ▁H . ▁Con way , ▁He idi ▁Burg iel , ▁Cha im ▁Good man - Str ass , ▁The ▁Sym met ries ▁of ▁Things ▁ 2 0 0 8 , ▁ ▁( Ch apter ▁ 2 6 ) ▁ ▁External ▁links ▁▁▁▁▁ ▁Category : 4 - poly top es <0x0A> </s> ▁The ▁World ▁Federation ▁of ▁Hem oph ilia ▁( WF H ) ▁is ▁an ▁international ▁non - pro fit ▁organization ▁dedicated ▁to ▁impro ving ▁the ▁lives ▁of ▁people ▁with ▁hem oph ilia ▁( also ▁sp elled ▁ha em oph ilia ) ▁and ▁other ▁gen etic ▁ble eding ▁dis orders . ▁It ▁educ ates ▁hem oph ilia cs ▁and ▁lo bb ies ▁for ▁improved ▁medical ▁treatment . ▁ 7 5 % ▁of ▁people ▁in ▁the ▁world ▁with ▁ble eding ▁dis orders ▁do ▁not ▁know ▁it ▁and ▁do ▁not ▁receive ▁care . ▁ ▁The ▁W F H ▁was ▁established ▁by ▁Frank ▁Sch n abel ▁in ▁ 1 9 6 3 ▁and