1. Van Stegman, G., Bornman, P.C., Terblanche, J., Marks, I.N.: Bleeding peptic ulcer—with special reference to high risk groups of patients. Surg. Gastroenterol.2:245, 1983
2. Chang, F., Drake, J.E., Parkes, G.J.: Massive gastrointestinal hemorrhage in the elderly. Am. J. Surg.134:721, 1977
3. Hunt, P.S., Hensky, J., Korman, M.G.: Mortality in patients with haematemesis and melaena: A prospective study. Br. Med. J.1:123, 1979
4. Wara, P., Stodkilde, H.: Bleeding patterns before admission before guide lines for emergency endoscopy. Scand. J. Gastroenterol.20:72, 1985
5. Cotton, P.B., Rosenberg, M.T., Waldram, R.P.C., Axon, A.T.R.: Early endoscopy of the oesophagus, stomach, duodenal bulb in patients with haematemesis and melaena. Br. Med. J.2:505, 1973