M. E. Carney and H. Herr, "Electric-Energetic Consequences of Springs in Lower-Extremity Powered Prostheses on Varied Terrain," 2020 8th IEEE RAS/EMBS International Conference for Biomedical Robotics and Biomechatronics (BioRob), New York City, NY, USA, 2020, pp. 989-996, doi: 10.1109/BioRob49111.2020.9224458.
Ahmad, Y. (2020). Tools that Lower the Floors, Widen the Walls, and Raise the Ceilings for Designing Creative Learning Experiences. (Masters Thesis). Massachusetts Institute of Technology.