Brattström, Håkan. “Shape of the Intercondylar Groove Normally and in Recurrent Dislocation of Patella: A Clinical and X-Ray Anatomical Investigation”. Acta Orthopaedica, vol. 35, no. sup68, May 1964, pp. 1-148, doi:10.3109/ort.1964.35.suppl-68.01.