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| 2 | P. W. Sauer and M. A. Pai, Power System Dynamics and Stability, Prentice Hall, 1998 |
| 3 | P. Kundur, Power System Stability and Control Analysis, McGraw-Hill, 1994. |
| 4 | A. J. Wood and B. F. Wollenberg, Power Generation, Operation and Control, John Wiley, 2000. |