Kleipool, Arthur E, et al. “Pain After Use of the Central Third of the Patellar Tendon for Cruciate Ligament Reconstruction: 33 Patients Followed 2-3 Years”. Acta Orthopaedica, vol. 65, no. 1, Jan. 1994, pp. 62-66, doi:10.3109/17453679408993720.