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IEEE Transactions on Power Delivery > 2016 > 31 > 3 > 1203 - 1212
Transactions of the American Institute of Electrical Engineers. Part III:... > 1962 > 81 > 3 > 913 - 920
Transactions of the American Institute of Electrical Engineers. Part III:... > 1962 > 81 > 3 > 81 - 85