1. American Psychiatric Association. (1994). Diagnostic and statistical manual of mental disorders ( 4th ed. ). Washington, DC: Author.
2. Arnér, S., andArnér, B. (1985). Differential effects of epidural morphine in the treatment of cancer-related pain. Acta Anaesthesiologica Scandinavica, 29, 332–336.
3. Arnér, S., and Meyerson, B. A. (1988). Lack of analgesic effect of opioids on neuropathie and idiopathic forms of pain. Pain, 33, 11–23.
4. Bloomfield, S. S., Barden, T. P., and Mitchell, J. (1976). Aspirin and codeine in two postpartum pain models. Clinical Pharmacology and Therapeutics, 24, 499–503.
5. Bozarth, M. A., and Wise, R. A. (1983). Dissociation of the rewarding and physical dependence-producing properties of morphine. In L. S. Harris (Ed.), Problems of drug dependence (NIDA Research Monograph Series No. 43, pp. 171–177). Washington, DC: U.S. Government Printing Office. Breitbart, W. (1987). Suicide in cancer patients. Oncology Review 1,49–55.