1. Winter DA. Biomechanics and Motor Control of Human Movement. New York: Wiley, 1990.
2. Biomechanical analysis of body mass transfer during stair ascent and descent in normal subjects;Zachazewski;J Rehabil Res Dev,1993
3. Smidt GL. Gait in Rehabilitation. New York: Churchill Livingstone, 1990.
4. Inman VT, Ralston HJ, Todd F. Human Walking. Baltimore: Williams and Wilkins, 1981.
5. Biomechanics of muscle with particular application to studies of gait;Elftman;J Bone Jt Surg,1966