Barium esophagram

Johnston BT, Troshinsky MB, Castell JA, Castell DO. Comparison of barium radiology with esophageal pH monitoring in the diagnosis of gastroesophageal reflux disease. American Journal Of Gastroenterology 1996; 91(6):1181-5.

Ott DJ, Dodds WJ, Wu WC, Gelfand DW, Hogan WJ, Stewart ET. Current status of radiology in evaluating for gastroesophageal reflux disease. Journal Of Clinical Gastroenterology 1982; 4(4):365-75.