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IEEE Transactions on Industry Applications > 1984 > IA-20 > 2 > 413 - 417
Transactions of the American Institute of Electrical Engineers. Part III:... > 1960 > 79 > 3 > 493 - 506
Transactions of the American Institute of Electrical Engineers. Part III:... > 1953 > 72 > 2-III > 1121 - 1129