Cameron, PJ. <br/><br/>
Designs, graphs, codes and their links 

 - Cambridge  CUP.  1991 
 - viii,240p.  25 cm. 
 - London mathematical society student texts .
<br/><br/><label>ISBN: </label>0521423856 
<br/><br/><label>Dewey Class. No.: </label>511.5,  / D, Cam