1. Ultra low power sensor interface, http://www.toumaz.com/ retrieved on June 2011.
2. FitBit, http://www.tbit.com/ retrieved on June 2011.
3. BodyBugg, http://www.bodybugg.com/ retrieved on June 2011.
4. Effects of placement and orientation of body-fixed accelerometers on the assessment of energy expenditure during walking;Bouten;Medical and Biological Engineering and Computing,1997
5. R.H. Barbieri, B.E Farella, B.A.L. Ricco, A low-power motion capture system with integrated accelerometers gesture recognition applications, in: International Symposium on VLSI Technology, Systems and Applications, 2004.