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2. Intravenous morphine for early pain relief in patients with acute abdominal pain;Pace;Acad Emerg Med,1996
3. Analgesia and the acute abdomen;Zoltie;Ann R Coll Surg,1986
4. Safety of early pain relief for acute abdominal pain;Attard;Br Med J,1992
5. 5. Cope 2 revised by Silen W. Early Diagnosis of the Acute Abdomen, 19th edition. New York: Oxford University Press, 1996, pp 5-6.