2) WHO: Histological typing of oral and oropharyngeal tumours. International Histological Classification of Tumours No.4, Geneva, 1971.
3) Jakobsson, P.A., Eneroth, C. M., et al.: Histologic classification and grading of malignancy in carcinoma of the larynx. Acta Radiol Ther Phys Biol 12: 1-8 1973.
5) Mashberg, A. and Meyers, H.: Anatomical site and size of 222 early asymptomatic oral squamous cell carcinomas. A continuing prospective study of oral cancer 11. Cancer 37: 2149-2157 1976.