1. Simultaneous manometric recording of internal and external anal sphincter reflexes;Schuster;Bull Johns Hopkins Hosp,1965
2. Surgical anatomy of the anal canal and the operative treatment of haemorrhoids;Milligan;Lancet,1937
3. Pathogenesis of anal fissure and implications as to treatment;Blaisdell;Surg Gynecol Obstet,1937
4. Surgical anatomy and disorders of the perianal space;Milligan;Proc R Soc Med,1943
5. Principles and practice of rectal surgery;Gabriel,1948