Warrington, A. R. van C. <br/><br/>
Protective relays :  their theory and practice / 
A. R. van C. Warrington 
 - 3rd ed. 
 - London :  Chapman & Hall,  1968 
<br/><br/>Includes references & index. 
<br/><br/><label>ISBN: </label>0412090600 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Protection engineer
<br/><br/><label>Dewey Class. No.: </label>621.317  / WAR