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IEEE Transactions on Industry Applications > 1987 > IA-23 > 6 > 1067 - 1072
Transactions of the American Institute of Electrical Engineers. Part III:... > 1961 > 80 > 3 > 1057 - 1059
Transactions of the American Institute of Electrical Engineers. Part III:... > 1959 > 78 > 4 > 1272 - 1282