1. Basal cell carcinoma of the anus;Klippel;Arch. Surg.,1954
2. Malignant anal lesions of epithelial origin;Buie;Journal-Lancet,1933
3. Basal cell carcinoma of the anus;Gross;New York State J. Med.,1948
4. Basal cell epithelioma of the anus;Guess;Tr. Am. Proct. Soc.,1935
5. Etiology of anal cancer;Rosser;Am. J. Surg.,1931