1. http://en.wikipedia.org/wiki/Mechanically_powered_flashlight
2. Hayakawa , M. 1991
3. SEIKO Watch Corporation 1988 SEIKO AGS Kinetic Quartz Watch http://www.seikowatches.com/story/landmarks/index.html/Kinetic
4. Williams , C.B. Yates , R.B. 1995 Proceedings of Transducers'95, Stockholm, Sweden, IEEE 369 372
5. PMG17 2009