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- http://www.piceramic.com/piezo_effect.phphttps://www.americanpiezo.com/knowledge-center/piezo-theory/piezoelectricity.htm
- http://en.wikipedia.org/wiki/Piezoelectricity
- https://www.americanpiezo.com/piezo-theory/ceramics.html
- https://www.americanpiezo.com/knowledge-center/piezo-theory/new-materials.html
- https://www.americanpiezo.com/piezo-theory/generators.html
- http://en.wikipedia.org/wiki/Amplified_piezoelectric_actuator#Applications
- http://www.matsysinc.com/products/transducers/examples.php
Widget Connector url http://www.youtube.com/watch?v=fHp95e-CwWQ - Jacob Fraden: Handbook of Modern Sensors (Physics, Designs and Applications), Fourth Edition, Springer