1. Measuring Current, Voltage and Power,1999
2. Patent US 4,199,696, Multiplier using Hall element.
3. Thin Film Magnetoresistive Sensors;Tumanski,2001
4. Patent EP 0218905, Low-cost self-contained transformerless solid state electronic watthour meter having thin film ferromagnetic current sensor.
5. Patent US 4,525,668, System for measuring electrical output or energy.