1. Oxford Textbook of Palliative Medicine,1998
2. The interface between oncology and palliative medicine;MacDonald,1998
3. Pharmacologic management of cancer pain;Coyle,1995
4. New clinical-practice guidelines for the management of pain in patients with cancer;Jacox;N Engl J Med,1994
5. Cancer pain management according to WHO analgesic guidelines;Schug;J Pain Symptom Manage,1990