1. What use is barium?;Simpkins, K.C.;Clin Radiol,1988
2. X-ray negative dyspepsia;Salter, R.H.;BrMedj,1977
3. Analysis of endoscopy and radiographin the diagnosis, follow-up and treatment of peptic ulcer disease;Cotton, P.B.; IlJ, Shorvon;Clinics in Gastroenterology,1984
4. Hazard of endoscopy;Schiller, K.F.R.; Prout, B.J.,1976
5. Oesophageal perforation at fibreoptic gastroscopy;Dawson, J.; Cockel, R.;BrMedj,1981