1. Current Comcepts in the Management of Chronic Pain;Le Roy,1977
2. International Directory of Pain Centers/Clinics;American Society of Anesthesiologists,1979
3. The clinical management of chronic pain;Black,1982
4. Chronic Pain: Its Social Dimensions;Kotarba,1983
5. Report of the Commission for the Evaluation of Pain;U.S. Department of Health and Human Services,1987