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2. Function and dysfunction at the cardia;Allison, P.R.;Bull. Johns Hopk. Hosp,1956
3. Mechanism protecting against gastro-oesophageal reflux: a review;Atkinson, M.;Gut,1962
4. The Gastro-oesophageal Junction;Botha, G.S.M.,1962
5. The Mechanical Factors of Digestion;Cannon, W.B.,1911