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IEEE Transactions on Industry Applications > 1984 > IA-20 > 3 > 615 - 624
Transactions of the American Institute of Electrical Engineers. Part III:... > 1962 > 81 > 3 > 376 - 382
Transactions of the American Institute of Electrical Engineers. Part III:... > 1961 > 80 > 3 > 1042 - 1046