OLSEN, A M Studies of oesophageal motility, with special reference to the differential diagnosis of diffuse spasm and achalasia (cardiospasm). [electronic resource] - Thorax Dec 1957 - 279-89 p. digital Publication Type: Journal Article ISSN: 0040-6376 Standard No.: 10.1136/thx.12.4.279 doi Subjects--Topical Terms: Diagnosis, DifferentialEsophageal Achalasia--physiologyEsophagus--physiologyHumansSpasm