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IEEE Transactions on Industry Applications > 1977 > IA-13 > 5 > 461 - 468
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:... > 1956 > 75 > 3-III > 1185 - 1192