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Transactions of the American Institute of Electrical Engineers > 1931 > 50 > 3 > 1132 - 1138
Transactions of the American Institute of Electrical Engineers > 1930 > 49 > 3 > 872 - 876
Transactions of the American Institute of Electrical Engineers > 1931 > 50 > 3 > 1132 - 1138
Transactions of the American Institute of Electrical Engineers > 1930 > 49 > 3 > 872 - 876