1. Evidence based approach to the treatment of hemorrhoidal disease;Johanson;Evidence Based Gastroenterol,2002
2. Symptomatic hemorrhoids: current incidence and complications of operative surgery;Bleday;Dis Colon Rectum,1992
3. The closed technique of hemorrhoidectomy;Ferguson;Surgery,1971
4. Surgical anatomy of the anal canal and the operative treatment of hemorrhoids;Milligan;Lancet,1937
5. Treatment of hemorrhoidal disease by reduction for mucosa and haemorrhoidal prolapse with a circular stapling device: a new procedure—6th World Congress of Endoscopic Surgery;Longo;Mundozzi Editor,1998