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IEEE Transactions on Industry Applications > 1978 > IA-14 > 6 > 465 - 469
Transactions of the American Institute of Electrical Engineers. Part III:... > 1962 > 81 > 3 > 459 - 460
Transactions of the American Institute of Electrical Engineers. Part III:... > 1962 > 81 > 3 > 431 - 459
Transactions of the American Institute of Electrical Engineers. Part III:... > 1959 > 78 > 4 > 1805 - 1808