Propst, R., and M. Buns Ph.D. “The Use of Prosthetic Vacuum Socket Suspensions: A Comparison of a Modified Bicycle Pump to Commercially Available Options”. International Journal of Medical Science and Clinical Invention, vol. 5, no. 8, Aug. 2018, pp. 3996-03, doi:10.18535/ijmsci/v5i8.04.