American Institute of Electrical Engineers, Transactions of the
Transactions of the American Institute of Electrical Engineers > 1950 > 69 > 2 > 692 - 698
Transactions of the American Institute of Electrical Engineers > 1950 > 69 > 2 > 1401 - 1408
Transactions of the American Institute of Electrical Engineers > 1950 > 69 > 2 > 872 - 881