1. P. Kundur, Power System Stability and Control (McGraw-Hill, New York, 1993)
2. J.J. Grainger, W.D. Stevenson, Power System Analysis (McGraw-Hill, New York, 1994)
3. ANSI/IEEE Standard C37.106 (1987), IEEE Guide for Abnormal Frequency Protection for Power Generating Plants
4. Applied Protective Relaying (1978), Westinghouse Electric Corporation. Relay-Instrument Division, Newark, N.J
5. M.S. Baldwin, H.S. Schenkel, Underfrequency Operation of Westinghouse Power Generation Equipment (Westinghouse Publication, New York, 1974). (GEN 74-009)