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IEEE Transactions on Industry Applications > 1979 > IA-15 > 4 > 376 - 381
Transactions of the American Institute of Electrical Engineers. Part III:... > 1960 > 79 > 3 > 188 - 191
Transactions of the American Institute of Electrical Engineers. Part III:... > 1959 > 78 > 3 > 400 - 401