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IEEE Transactions on Industry Applications > 1983 > IA-19 > 6 > 975 - 979
Transactions of the American Institute of Electrical Engineers. Part III:... > 1957 > 76 > 3 > 791 - 796
Transactions of the American Institute of Electrical Engineers. Part III:... > 1957 > 76 > 3 > 652 - 655