1. Surgical correction of chronic anal fissure: Results of lateral internal sphincterotomy vs.fissurectomy-midline sphincterotomy;Abcarian;Dis Colon Rectum,1980
2. Fundamentals of Anorectal Surgery;Beck,1992
3. Colon and Rectal Surgery;Corman,1993
4. The surgical correction of chronic internal anal (sphincteric) contracture;Eisenhammer;S Afr Med J,1951
5. The evaluation of the internal anal sphincterotomy operation with special reference to anal fissure;Eisenhammer;Surg Gynecol Obstet,1959