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IEEE Transactions on Industry Applications > 1978 > IA-14 > 2 > 128 - 134
Transactions of the American Institute of Electrical Engineers. Part III:... > 1954 > 73 > 2-III-B > 1580 - 1585
Transactions of the American Institute of Electrical Engineers. Part III:... > 1954 > 73 > 2-III-B > 1486 - 1499