Bacci, Gaetano, et al. “Predictive Factors for Local Recurrence in Osteosarcoma 540 Patients With Extremity Tumors Followed for Minimum 2.5 Years After Neoadjuvant Chemotherapy”. Acta Orthopaedica, vol. 69, no. 3, Jan. 1998, pp. 230-6, doi:10.3109/17453679809000921.