1. The lower esophageal ring: how unique;Wilkins;Ann Thoracic Surg,1984
2. X-ray examination of the stomach;Templeton,1944
3. Dysphagia due to a diaphragm-like localized narrowing in the lower esophagus (“lower esophageal ring”);Schatzki;AJR,1953
4. Lower esophageal ring;Goyal;N Engl J Med,1970
5. The anatomic basis for the lower esophageal contraction ring: plication theory and its application;Steinnon;Am J Radiol,1963