1. Anden, N. E., Butcher, S. G., Corrodi, H., Fuxe, K. & Ungerstedt, U. Eur. J. Pharmac. 11, 303–314 (1970).
2. Creese, I. & Snyder, S. H. in Psychopharmacology: A Generation of Progress (eds Lipton, M. A., DiMascio, A. & Killam, K. F.) 377–388 (Raven, New York, 1978).
3. Kebabian, J. W., Petzold, G. L. & Greengard, P. Proc. natn. Acad. Sci. U.S.A. 69, 2145–2149 (1972).
4. Mao, C. C., Cheney, D., Marco, E., Revuelta, A. & Costa, E. Brain Res. 132, 375–379 (1977).
5. Mao, C. C., Revuelta, A., Marco, E. & Costa, E. in Neuropsychopharmacology (eds Deniker, P., Radouco-Thomas, C. & Villeneuve, A.) 447–452 (Pergamon, Oxford, 1978).