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IEEE Transactions on Industry Applications > 1986 > IA-22 > 5 > 865 - 873
Transactions of the American Institute of Electrical Engineers. Part III:... > 1956 > 75 > 3-III > 1221 - 1228
Transactions of the American Institute of Electrical Engineers. Part III:... > 1955 > 74 > 3-III > 1313 - 1323