1. Levels of intragastric and intraduodenal acidity;Atkinson, M.; Henley, K.S.;Clin. Sci,1955
2. The histological background to gastric ulcer;Ball, P.A.J.; James, A.H.;Lancet,1961
3. The acidity of the 'ulcer-bearing area' of the duodenum in normal persons;Berk, J.E.; Rehfuss, M.E.; Thomas, J.E.;Amer. J. dig. Dis,1942
4. Effect of ulcer on acidity and neutralizing ability in duodenal bulb;Berk, J.E.; Rehfuss, M.E.; Thomas, J.E.;Arch. intern. Med,1942
5. Intraluminal and juxtamucosal duodenal pH;Bircher, J.; Mann, C.V.; Carlson, H.C.; Code, C.F.; Rovelstad, R.A.;Gastroenterology,1965