Blackburn, J.L.: Applied Protective Relaying, Newark, Westinghouse Electric Corporation, 1976
Warrington, A.R. van C.: Protective Relays : Their Theory and Practice, London, 1971
Whitaker, J. C.: AC Power Systems, CRC Press 1991
Burke J. J.: Power Distribution Engineering: Fundamentals and Applications, New York, 1994
Machowski, J., Bialek, J., Bumby, J.: Power System Dynamics and Stability, Chichester, 1997
Horowitz, S., Phadke, A.: Power System Relaying, Tanton, 1995