IEEE Transactions on Power Systems (2005) - Comment
doi: 10.1109/tpwrs.2005.857386  issn: 0885-8950 

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Z. Zhong, C. Xu, B.J. Billian, L. Zhang, S.-J.S. Tsai, R.W. Conners, V.A. Centeno, A.G. Phadke, Y. Liu