1. Epidermoid carcinoma of the anorectum;Stearns;Surg. Gynecol. Obstet.,1970
2. Malignant melanoma of the anal canal;Morson;J. Clin. Pathol.,1963
3. Squamous cell carcinoma of the anus, anal canal and rectum in 109 patients;Richards;Surg. Gynecol. Obstet.,1962
4. Anorectal melanoma;Mason;Cancer,1966