Jonsson, Håkan, et al. “Laxity After Cruciate Ligament Injury in 94 Knees: The KT-1000 Arthrometer Versus Roentgen Stereophotogrammetry”. Acta Orthopaedica, vol. 64, no. 5, Jan. 1993, pp. 567-70, doi:10.3109/17453679308993694.