1. (1) http://www.bipm.org/exalead_kcdb/exa_kcdb.jsp?_p=AppB&_q=ratio
2. (2) A. Igarashi and T. Nakase : “A Self-Calibration Precision Inductive Voltage Divider”, Tech. Report. Japan Electric Meters Inspection Corp., Vol. 5, No. 2, pp. 73-81 (1970) (in Japanese)
3. (3) S. Tsutsumi and A. Igarashi : “Development of Inductive Voltage Divider with High Input Impedance at Wideband Frequency”, The Papers of Technical Meeting on Instrumentation and Measurement, IEE Japan IM-05-59, pp. 5-9 (2005) (in Japanese)