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IEEE Transactions on Industry Applications > 1981 > IA-17 > 2 > 133 - 142
Transactions of the American Institute of Electrical Engineers. Part III:... > 1960 > 79 > 3 > 679 - 683
Transactions of the American Institute of Electrical Engineers. Part III:... > 1959 > 78 > 3 > 618 - 623