Niblo, G.A & Roller, M.A (eds) <br/><br/>
Geometric group theory Vol.1 
Ed by G.A. Niblo & M.A. Roller 
 - Cambridge  CUP  1993 
 - 212 
 - London Mathematical Society lecture notes series 181 .
<br/><br/><label>ISBN: </label>9780521435291