1. Agnati, L. F., Bjelke, B., and Fuxe, K. (1992). Volume transmission in the brain.Am. Sci. 80:362–373.
2. Akil, H., Watson, S. J., Young, E., Lewis, M. E., Khachaturian, H., and Walker, J. M. (1984). Endogenous opioids: Biology and function.Annu. Rev. Neurosci. 7: 223–255.
3. Aman, M. G., and Singh, N. N. (eds.) (1988)Psychopharmacology of the Developmental Disabilities, Springer-Verlag, New York.
4. Atkinson, R. L. (1984). Endocrine and metabolic effects of opiate antagonists.J. Clin. Psychiatry 45: 20–24.
5. Barrera, F. J., Teodoro, J. M., and Goldberg, B. (1992, March).Clinical tests of the endorphin theory of self-injurious behaviour, Presented at the 3rd Annual Convention of the Ontario Association of Developmental Disabilities Toronto, Ontario.