“ Synovial Sarcoma of the Extremities: Prognostic Factors for 20 Nonmetastatic Cases and a New Histologic Grading System With Prognostic Significance ”. Clinics, vol. 61, no. 5, Oct. 2006, pp. 381-6, https://doi.org/10.1590/S1807-59322006000500003.