Ziegler, Gerhard. <br/><br/>
Numerical distance protection :  principles and applications / 
Gerhard Ziegler. 
 - 4th updated and enl. ed. 
 - Erlangen :  Publicis Publishing,  2011. 
 - 419 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references (p. 364-371 ) and index. 
<br/><br/><label>ISBN: </label>9783895783814 (hbk.)  RM227.29 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric power systems--Protection.<br/>Protective relays.