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IET Generation, Transmission & Distribution > 2008 > 2 > 3 > 424 - 432
Transactions of the American Institute of Electrical Engineers. Part III:... > 1959 > 78 > 4 > 1072 - 1074
Transactions of the American Institute of Electrical Engineers. Part III:... > 1958 > 77 > 3 > 1452 - 1458