American Institute of Electrical Engineers, Transactions of the
Transactions of the American Institute of Electrical Engineers > 1941 > 60 > 4 > 173 - 178
Transactions of the American Institute of Electrical Engineers > 1941 > 60 > 8 > 843 - 846
Transactions of the American Institute of Electrical Engineers > 1941 > 60 > 12 > 1161 - 1167