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IEEE Transactions on Industry Applications > 1986 > IA-22 > 6 > 1133 - 1141
IEEE Transactions on Industry Applications > 1978 > IA-14 > 1 > 33 - 39
Transactions of the American Institute of Electrical Engineers. Part III:... > 1958 > 77 > 3 > 800 - 804
Transactions of the American Institute of Electrical Engineers. Part III:... > 1958 > 77 > 3 > 1463 - 1467