Ryder, John D. <br/><br/>
Networks, Lines and Fields 

 - 2 
 - New Delhi  Prentice-Hall of India  1988 
 - p.593 
<br/><br/><label>ISBN: </label>08759229910 
<br/><br/><label>Dewey Class. No.: </label>621.3841 R99N