1. Al-Jurf AS, Turnbull RB, Fazio VW (1979) Local treatment of squamous cell carcinoma of the anus. Surg Gynecol Obstet 148: 576–578
2. Austin DF (1982) Etiological clues from descriptive epidemiology: Squamous carcinoma of the rectum or anus. NCI Monogr 62: 89–90
3. Beahrs OH (1979) Management of cancer of the anus. AJR 133: 790–795
4. Beahrs OH, Wilson SM (1976) Carcinoma of the anus. Ann Surg 1984: 422–428
5. Bensaude A, Nora J (1968) Differential diagnosis of carcinoma of the anal margin. Proc R Soc Med 61: 624–626