1. D.A. Winter, Biomechanics and motor control of human gait: normal, elderly and pathological, Waterloo Biomechanics, 1991.
2. Calf muscle moment, work and efficiency in level walking; role of series elasticity;Hof;J. Biomech.,1983
3. R. Riener, M. Rabuffetti, C. Frigo, Joint powers in stair climbing at different slopes, in: Engineering in Medicine and Biology, 1999. 21st Annual Conference and the 1999 Annual Fall Meetring of the Biomedical Engineering Society, BMES/EMBS Conference, 1999. Proceedings of the First Joint, vol. 1, IEEE, 1999, p. 530.
4. Energy cost of walking of amputees: the influence of level of amputation;Waters;J. Bone Joint Surg.,1976
5. Walking in an unstable environment: strategies used by transtibial amputees to prevent falling during gait;Hak;Arch. Phys. Med. Rehabil.,2013