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IEEE Transactions on Industry Applications > 1984 > IA-20 > 4-I > 935 - 941
Transactions of the American Institute of Electrical Engineers. Part III:... > 1955 > 74 > 3-III > 1230 - 1233
Transactions of the American Institute of Electrical Engineers. Part III:... > 1954 > 73 > 2-III-B > 1011 - 1016