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IEEE Transactions on Industry Applications > 1986 > IA-22 > 2 > 330 - 337
Transactions of the American Institute of Electrical Engineers. Part III:... > 1957 > 76 > 3 > 1205 - 1208
Transactions of the American Institute of Electrical Engineers. Part III:... > 1953 > 72 > 2-III > 267 - 277