1. Primary retroperitoneal tumors: Report of 95 cases and review of literature;Donnelly;Surg., Gynec. & Obst.,1946
2. Primary retroperitoneal tumors: Study of 120 cases;Pack;Surg., Gynec. & Obst.,1954
3. Primary retroperitoneal tumors : Report of 3 cases and 107 cases from literature;Frank;Surg.,1938
4. Primary retroperitoneal tumors: Summary of 33 cases;Newman;Arch. Surg.,1950
5. Atlas of Tumor Pathology;Ackerman,1954