1. Sankaran PS. Sushruta’s contribution to surgery. Varanasi: Ideological Book House; 1976.
2. Akinola DO, Hamed AD. Fistula in ano in Nigerians. Trop Gastroenterol. 1989;10:153–7.
3. Navruzov SN, Dul’tsev IV, Salamov KN. Causes and prevention of rectal fistula recurrences. Vestn Khir Im I I Grek. 1981;27:43–6.
4. Ramanujam PS, Prasad ML, Abcarian H, Tan AB. Perianal abscess and fistulas; a study of 1023 patients. Dis Colon Rectum. 1984;27:593–7.
5. Sainio P. Fistula in ano in a defined population. Incidence and epidemiologic aspects. Ann Chir Gynaecol. 1984;73:219–24.