1. Crystallographic Groups of Four-Dimensional Space;Brown,1978
2. Regular Polytopes;Coxeter,1973
3. B. Eick, F. Gähler, W. Nickel, The GAP package Cryst, http://www.math.uni-bielefeld.de/~gaehler/.
4. V. Felsch, F. Gähler, The GAP package CrystCat, http://www.math.uni-bielefeld.de/~gaehler/.
5. F. Gähler, The GAP package Carat, http://www.math.uni-bielefeld.de/~gaehler/.