1. R. Pierce, “Expansible cover,” U.S. Patent No. 2211478, 1940.
2. P. Warszawska, “Artificial pneumatic muscles,” U.S. Patent No. 6704918, 1967.
3. C. P. Chou and B. Hannaford, “Measurement and modeling of McKibben pneumatic artificial muscles,” IEEE Trans. on Robotics and Automation, vol. 12, no. 1, pp. 90–102, 1996.
4. H. F. Schulte, “The characteristics of the McKibben artificial muscle,” The Application of External Power in Prosthetics and Orthotics, pp. 94–115, 1961.
5. R. H. Gaylord, “Fluid actuated motor system and stroking device,” U.S. Patent No. 9518851958.