Warrington, A.R. van C. <br/><br/>
Protective relays :  their theory and practice / 
A.R. van C. Warrington. 
 - 3rd ed. 
 - London :  Chapman and Hall,  c1977. 
 - 2 v. 
<br/><br/><label>ISBN: </label>0412153807 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Protective relays.