Electrical Engineers, Journal of the Institution of
Journal of the Institution of Electrical Engineers > 1919 > 57 > 2-S > 158 - 188
Journal of the Institution of Electrical Engineers > 1919 > 57 > 2-S > 268 - 276
Journal of the Institution of Electrical Engineers > 1919 > 57 > 2-S > 223 - 230