American Institute of Electrical Engineers, Transactions of the
Transactions of the American Institute of Electrical Engineers > 1935 > 54 > 3 > 272 - 279
Transactions of the American Institute of Electrical Engineers > 1935 > 54 > 3 > 279 - 281
Transactions of the American Institute of Electrical Engineers > 1935 > 54 > 6 > 663 - 667