WILLAM  MAGNUS <br/><br/>
COMBINATORIAL GRUP THEORY   

 - MINEOLA,NEW YORK  DOVER PUBLICAT. INC.  2004 
<br/><br/><label>ISBN: </label>978-0-486-43830-6 
<br/><br/><label>Dewey Class. No.: </label>512  / MAG/C