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IEEE Transactions on Industry Applications > 1978 > IA-14 > 6 > 481 - 491
Transactions of the American Institute of Electrical Engineers. Part III:... > 1959 > 78 > 4 > 1353 - 1362
Transactions of the American Institute of Electrical Engineers > 1949 > 68 > 2 > 1337 - 1342