1. Andrews, B.J.; Baxendale, R.H. A hybrid orthosis incorporating artificial reflexes for spinal cord damaged patients. J. Physiol. 380:19; 1986.
2. Andrews, B.J.; Baxendale, R.H.; Barnett, R.; Phillips, G.F.; Yamazaki, T.; Paul, J.P.; Freeman, P.A. Hybrid FES orthosis incorporating closed loop control and sensory feedback. J. Biomed. Eng. 10:189–195; 1988.
3. Andrews, B.J.; Barnett, R.W.; Phillips, G.F.; Kirkwood, C.A.; Donaldson, N.; Rushton, D.N.; Perkins, T.A., Rule-based control of a hybrid FES orthosis for assisting paraplegic locomotion. 11:175–199; 1989.
4. Bar, A.; Ishai, G.; Meretsky, P.; Koren, Y. Adaptive microcomputer control of an artificial knee in level walking. J. Biomed. Eng. 5:145–150; 1983.
5. Bellman, R. Dynamic programming. Princeton, NJ: Princeton University Press; 1957.