Warrington, A. R. van C. <br/><br/>
Protective relays :  their theory and practice / 
by A.R. van C. Warrington. 
 - 2nd ed. 
 - [London] :  Chapman & Hall,  1968. 
 - xv, 484 p. :  ill. ;  25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Protective relays.<br/>Electric relays.