1. 27) EI Naggar, A.K. and Reichart, P.A.: Proliferative verrucous leukoplakia and precancerous conditions. In Barnes, I., Eveson, J.W., Reichart, P., et al.: Pathology and genetics head and neck tumours, IARC Press, Lyon, pp. 180-181, 2005. (World Health Organization Classification of Tambours)