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Transactions of the American Institute of Electrical Engineers. Part III:... > 1962 > 81 > 3 > 920 - 921
Transactions of the American Institute of Electrical Engineers. Part III:... > 1960 > 79 > 3 > 1117 - 1120
Transactions of the American Institute of Electrical Engineers. Part III:... > 1960 > 79 > 3 > 331 - 332