1. A.C. Scott, “Physical Activity Assessment in Wheelchair Users”, PhD dissertation, University of Tennessee, USA, 2011.
2. Older people’s use of powered wheelchairs for activity and participation;Brandt;J. Rehab. Med.,2004
3. Mobility difficulties are not only a problem of old age;Iezzoni;J. Gen. Int. Med.,2001
4. R.A. Cooper, Wheelchair Selection and Configuration, Vols. ISBN 1-8888799-18-8, New York: Demos Medical Publishing Inc., 1998.
5. NeXOS – the design, development and evaluation of a rehabilitation system for the lower limbs;Bradley;Mechatronics,2009