1. Concept Note. World Report on Disability and Rehabilitation. Geneva, World Health Organization (2008).
http://www.who.int/disabilities/publications/dar_world_report_concept_note.pdf
2. Armstrong, W.: Guidelines on the provision of Manual Wheelchairs in less resourced settings. World Health Organ. 21(8), 20–22 (2008)
3. Ruzaij, M., Neubert, S., Stoll, N., Thurow, K.: Auto calibrated head orientation controller for robotic-wheelchair using MEMS sensors and embedded technologies. In: IEEE Sensors Applications Symposium (SAS), pp. 1–6 (2016)
4. Chritensen, H.V., Garcia, J.C.: Infrared non- contact head sensor, for control of wheelchair movements. In: 8th European Conference for the Advancement of Assistive Technology in Europe, pp. 336–340 (2005)
5. Rockland, R.H., Reisman, S.: Voice activated wheelchair controller. In: Proceedings of the IEEE 24th Annual Northeast Bioengineering Conference, vol. 10, no. 4, pp. 128–129 (1998)