Coba jelasin Lihat pula dari Simetri ikosahedral dong

Kaleidoscopes: Selected Writings of H.S.M. Coxeter, edited by F. Arthur Sherk, Peter McMullen, Anthony C. Thompson, Asia Ivic Weiss, Wiley-Interscience Publication, 1995,

N.W. Johnson: Geometries and Transformations, (2018)  Chapter 11: Finite symmetry groups, 11.5 Spherical Coxeter groups