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IEEE Transactions on Industry Applications > 1986 > IA-22 > 2 > 360 - 364
Transactions of the American Institute of Electrical Engineers. Part III:... > 1958 > 77 > 3 > 145 - 157
Transactions of the American Institute of Electrical Engineers. Part III:... > 1958 > 77 > 3 > 669 - 685