1) Friedell HL, Rosenthal : The etiologic role of chewing tobacco in cancer of the mouth. Report of eight cases treated with radiation. JAMA,116 : 2130-2135, 1941
2) Ackerman LV : Verrucous carcinoma of the oral cavity. Surgery, 23 : 670-678, 1948
3) Schwartz RA : Verrucous carcinoma of the skin and mucosa. J Am Acad Dermatol, 32 : 1-21, 1995
4) Aird I, Johnson HD, Lennox B, et al : Epithelioma cuniculatum : A variety of squamous carcinoma peculiar to the foot. Br J Surg, 42 : 245-250, 1954