Park, Geumju, et al. “Low-Dose External Beam Radiotherapy As a Postoperative Treatment for Patients With Diffuse Pigmented Villonodular Synovitis of the Knee”. Acta Orthopaedica, vol. 83, no. 3, June 2012, pp. 256-60, doi:10.3109/17453674.2012.678803.