1. Sound and pressure signals obtained from a single intracardiac transducer;Allard;IRE Transactions on Biomedical Electronics,1962
2. All about Circuits 1 (2014). Strain gauges. Volume I—DC, Chapter 9: Electrical instrumentation signals. Accessed 18.04.14.
3. All about Circuits 2 (2014). Strain gauges. Volume I—DC, Chapter 14: Magnetism and electromagnetism. Accessed 18.04.14.
4. Analog Devices (2014). ADXL105: ±5g Single axis high performance accelerometer with analog output. Accessed 10.06.14.
5. Measurement of tissue motion;Anderson;Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine,1999