1. Barrie, J. D. (1961). (chemodectoma).
2. 1136. A review of twenty cases;Fisher, J.H.;Hemangiopericytoma: Canad. med. Ass. J,1960
3. P. (1942). The and behavior, Path., 18, 183.
4. Hemangiopericytoma;D.,1965
5. Hemangiopericytoma: A study of twenty-five new cases;Stout, A.P.;Cancer,1949