1. Peizer E, Freiberger H, Wright D (1964) Bioengineering methods of wheelchair evaluation. Bull Prosthet Res 10: 19–37.
2. Hildenbrandt G, Voigt E D, Berendes B, Kroeger J (1970) Energy cost of propelling wheelchair at various speeds: Cardiac responses and effect on steering accuracy. Arch Phys Med Rehabil 51: 131–136.
3. Zwirn L D, Bar-Or O (1975) Responses to exercise of paraplegics who differ in conditioning level. Med Sci Sports Exerc 7: 94–98.
4. Yekutiel M, Brooks E M, Ohry A, Jarom J, Carel R (1983) The relevance of hypertension, ischemic heart disease and diabetes in traumatic spinal cord injured patients and amputees. Paraplegia 27: 58–62.
5. Hjeltnes N (1980) Control of medical rehabilitation of para- and tetraplegics. In Natvig H, editor. The First International Congress on Sports for the Disabled. Royal Ministry of Church and Education, Oslo: 162–173.