Warrington,A <br/><br/>
Protective Relays: Theory and Practice 

 - 3rd 
 - London  Chapman Hall  2012 
 - xvi,340p. 
<br/><br/><label>ISBN: </label> RS 895.00 
<br/><br/><label>Dewey Class. No.: </label>621.31 WAR,AR