1. Tumoren des Retroperitoneums;Mihatsch;Helv. Chir. Acta,1989
2. Tumors of the retroperitoneum;Felix;Curr. Probl. Cancer,1981
3. Collective review: primary retroperitoneal tumors: study of 120 cases;Pack;Surg., Gynec. & Obst,1954
4. Benign retroperitoneal schwannoma;Donnal;Urology,1988
5. Schwannomas;Deming;J. Urol.,1954