1. Hemangiopericytoma of retroperitoneal space;Ackerman;J. Missouri M. A.,1948
2. Hemangiopericytoma of the sigmoid colon;Ault;Surgery,1951
3. Hemangiopericytoma;Bacon;Minnesota Med.,1950
4. Sacral and presacral tumors;Brindley;Ann. Surg.,1945
5. Hemangiopericytoma (glomus tumor) of the mediastinum;Fergeson;Surgery,1954