R. P. Jakob, H. Hassler, and H.-U. Staeubli, “Observations on Rotatory Instability of the Lateral Compartment of the Knee: Experimental Studies on the Functional Anatomy and the Pathomechanism of the True and the Reversed Pivot Shift Sign”, ActaO, vol. 52, no. sup191, pp. 1–34, Sep. 1981.