Hofstadter, Douglas R <br/><br/>
Godel,Escher,Bach : an eternal Golden braid 

 -  Basic Books  New York   1999 
 - xxi, 777p.   
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>978465026562 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Artificial intelligence<br/>Metamathematics<br/>Symmetry