1) Tuttle, S.G. and Grossman, M.I.: Detection of gastroesophageal reflux by simultaneous measurement of intraluminal pressure and pH. Proc Soc Exp Med 28: 564-577, 1958
2) Bernstein, L.M. and Baker, L.A.: A clinical test for esophagitis. Gastroenterology 34: 760-781, 1958
3) Kantrowitz, P.A., Corson, J.G., Fleischli, D.J., et al.: Measurement of gastroesophageal reflux. Gastroenterology 56: 666-674, 1969
4) Booth, D.J., Kenmerer, W.T. and Skinner, D. B.: Acid clearing from the distal esophagus. Arch Surg 96: 731-734, 1968
5) Fyke, F.E., Code, C.F. and Schlegel, J.F.: The gastroesophageal sphincter in healthy human beings. Gastroenteroloia 86: 135-150, 1956