1. Aspherical relative presentations;Bogley,1992
2. An introduction to the group theory language Cayley;Cannon,1981
3. The abstract groups Gm,n,p;Coxeter;Trans. Amer. Math. Soc.,1939
4. The abstract group G3,7,16;Coxeter,1962
5. The abstract group G3,7,16;Coxeter,1962