1. Motility in fifty patients with achalasia of the esophagus;Csendes, A.; Uribe, P.; Larrain, A.;AmJ Gastroentrol,1974
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5. Achalasia of the esophagus: pathologic and etiologic considerations;Cassella, R.R.; Brown, A.L.; Sayre, G.P.; Ellis, F.H.;Ann Surg,1964