1) Pindborg, J. J. and Kramer, I. R. H.: Histological Typing of Odontogenic Tumours, Jaw Cysts and Allied Lesions. International histological classification of tumours, No.5, World Health Organization, Geneva, 1-44, 1971.
2) Schajowicz, F., Ackerman, L. V. and Sissons, H. A.: Histological Typing of Bone Tumours. International histological classification of tumours, No.6, World Health Organization, Geneva, 1-60, 1972.