1. The World Health Organization Cancer Pain and Palliative Care Program. Past, present and future;Stjernswärd;J Pain Symptom Manage,1996
2. Colleau SM, Weis N. WHO guidelines on cancer pain, opioid availability, symptom control and palliative care: ordering information. University of Wisconsin Pain and Policy Studies Group/WHO Collaborating Center for Policy and Communications in Cancer Care; Madison, Wisconsin, USA. Prepared for 9th World Congress on Pain, International Association for the Study of Pain, Vienna, Austria, August 19–26, 1999.
3. World Health Organization. Cancer pain relief and palliative care. Report of a WHO Expert Committee (WHO Technical Report Series, No. 804). Geneva: World Health Organization, 1990.
4. National cancer control programmes;World Health Organization,2002
5. Achieving balance in national opioids control policy—guidelines for assessment;World Health Organization,2000