Giuffrè, G., Barresi, V., Catalano, A., Cappiello, A., Stagno d’Alcontres, F. and Tuccari, G. (2009) “Actinic keratosis associated with squamous and basal cell carcinomas: an evaluation of neoplastic progression by a standardized AgNOR analysis”, European Journal of Histochemistry, 52(1), pp. 53–60. doi: 10.4081/1186.