Azza H. Mahmoud Kay, M. W., Roe, S. C., Stikeleather, L. F., Mahmoud, A., & Abrams, C. F. (1998). Axial vibration of threaded external fixation pins: Detection of pin loosening. ANNALS OF BIOMEDICAL ENGINEERING, 26(3), 361–368. https://doi.org/10.1114/1.92