Duff, M. J <br/><br/>
Quantum structure of space and time 
/ by M. J. Duff 
 - Great Britain   Cambridge University Press  1982 
 - xiii, 432p.  
<br/><br/><label>ISBN: </label>0 521 24732 2 
<br/><br/><label>Dewey Class. No.: </label>531.5  / DUF/Q