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Diseases of the Rectum and Colon and Their Surgical Treatment}} } @incollection{b2, , title={{The treatment of anal fissure by lateral subcutaneous internal sphincterotomy: a technique and results}} , author={{ MJNotaras }} , journal={{Br J Surg}} 58 2 , year={1971} } @incollection{b3, , title={{Internal anal sphincter derangement with anal fissure}} , author={{ BJNothmann } and { MMSchuster }} , journal={{Gastroenterology}} 67 , year={1974} } @incollection{b4, , title={{Relationship between anal pressure and anodermal blood flow. 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