1. Jacobsen S.A.: The Comparative Pathology of the Tumors of Bone, pp. 129–152. Charles C. Thomas Publisher, Springfield, III, 1971.
2. Schajowicz F., Ackerman L.V., Sissons H.A.: Histological Typing of Bone Tumours, pp. 31–48. World Health Organization, Geneva, 1972.