1. Allen, C. E. L. (1963) The University of Capetown lower limb prosthetic principle.S. Afr. med. J.,37, 607–616.
2. Close, J. R. (1964)Motor Function in the Lower Extremity. p. 79. Thomas, Springfield, Ill.
3. George, R. E. (1956) A transistor electromyograph amplifier,Ann. Phys. Med.,3, 66–67.
4. Report on Fundamental Studies of Human Locomotion Relating to the Design of Artificial Limbs (1947) University of California, San Francisco.
5. Sheffield, F. J., Gersten, J. W. andMastellone, A. F. (1956) Electromyographic study of the muscles of the foot in normal walking.Am. J. Phys. Med.,35, 223–236.