Warrington, Albert Russell van Cortlandt. <br/><br/>
Protective relays :  their theory and practice / 

 - 3d ed. 
 - London   Chapman and Hall   1977 
 - xiii, 431p. :   ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0412153807 
<br/><br/><label>LC Class. No.: </label>TK2861  / .W25 1977