Kobayashi, T., Leung, A., Akazawa, Y., Naito, H., Tanaka, M., & Hutchins, S. Design of an automated device to measure sagittal plane stiffness of an articulated ankle-foot orthosis. Prosthetics and Orthotics International, 34(4), 439-448. https://doi.org/10.3109/03093646.2010.495370