1. Jacox A, Carr D, Payne R: Management of Cancer Pain: Clinical Practice Guidelines. Rockville: Agency for Health Care Policy and Research, US Department of Health and Human Services, Public Health Service; 1994.
2. Calvillo O, Henry JL, Neuman RS: Effects of morphine and naloxone on dorsal horn neurones in the cat. Can J Physiol Pharmacol 1974, 52:1207–1211.
3. Du Pen SL, Peterson DG, Bogosian AC: A new permanent exteriorized epidural catheter for narcotic selfadministration to control cancer pain. Cancer 1987, 59:986–993.
4. Cousins M, Bridenbaugh P: Neural Blockade in Clinical Anesthesia and Management of Pain, edn 3. Philadelphia: Lippincott-Raven; 1998, 1177:941–944. Provides excellent psychologic evaluations of patients with pain.
5. Doleys DM, Olson K: Psychological Assessment and Intervention in Implantable Pain Therapies. Columbia Heights, MN: Medtronic Neurological; 1997:1–20. Provides excellent psychologic evaluations of patients with pain.