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IEEE Transactions on Industry Applications > 1987 > IA-23 > 3 > 490 - 497
Transactions of the American Institute of Electrical Engineers. Part III:... > 1958 > 77 > 3 > 1082 - 1090
Transactions of the American Institute of Electrical Engineers. Part III:... > 1957 > 76 > 3 > 1229 - 1230