Iversen, B. F., Stürup, J., Lyndrup, P., Jensen, N. C., & Therkilden, M. H. (1988). Screw fixation in the femoral head: Pull-out tests in cadavers. Acta Orthopaedica, 59(6), 655–657. https://doi.org/10.3109/17453678809149418