1. Primary retroperitoneal tumors;Braasch;Surg Clin North Am,1967
2. Primary retroperitoneal tumors;Donnelly;Surg Gynecol Obstet,1946
3. Primary retroperitoneal tumors. A review of 26 cases;Jacobsen;Acta Chir Scand,1974
4. Primary retroperitoneal tumors;Johnson;Am J Surg,1954
5. Collective review: primary retroperitoneal tumors, study of 120 cases;Pack;Int Abstr Surg,1954