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IEEE Transactions on Industry Applications > 1977 > IA-13 > 5 > 469 - 475
Transactions of the American Institute of Electrical Engineers. Part III:... > 1959 > 78 > 4 > 1561 - 1564
Transactions of the American Institute of Electrical Engineers. Part III:... > 1954 > 73 > 2-III-B > 1580 - 1585