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IEEE Transactions on Industry Applications > 1986 > IA-22 > 6 > 1133 - 1141
Transactions of the American Institute of Electrical Engineers. Part III:... > 1958 > 77 > 3 > 1463 - 1467
Transactions of the American Institute of Electrical Engineers. Part III:... > 1954 > 73 > 2-III-B > 1005 - 1010