Superstrings :  a theory of everything / 
Edited by P. C. W. Davies, J. Brown 
 - New York :  Cambridge university press,  1988       
 - x, 234 p. 
<br/><br/><label>ISBN: </label>052143775X 
<br/><br/><label>LC Class. No.: </label>QC 794 S959 1988