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Raouf, M. , Anarmarzi, E. , Lesani, H. , Olamaei, J.. "Power System Damping Using Hierarchical Fuzzy Multi- Input Power System Stabilizer and Static VAR Compensator". World Academy of Science, Engineering and Technology, Open Science Index 51, International Journal of Electrical and Computer Engineering (2011), 5(3), 344 - 350.