1. Bloom, F. E., Algeri, S., Gropetti, A., Revuelta, A., Costa, E.: Lesions of central norepinephrine terminals with 6-OH-dopamine: Biochemistry and fine structure. Science 166, 1284?1286 (1969).
2. Breese, G. R., Traylor, T. D.: Effect of 6-hydroxydopamine on brain norepinephrine and dopamine: evidence for selective degeneration of catecholamine neurons. J. Pharmacol. exp. Ther. 174, 413?420 (1970).
3. Cheney, D. L., Goldstein, A.: The effect of p-chlorophenylalanine on opiate-induced running, analgesia, tolerance and physical dependence in mice. J. Pharmacol. exp. Ther. 177, 309?315 (1971).
4. Conner, R. L., Stolk, J. M., Barchas, J. D., Levine, S.: Parachlorophenylalanine and habituation to repetitive auditory startle stimuli in rats. Physiol. Behav. 5, 1215?1219 (1970).
5. Contreras, E., Huidobro, F.: Hyposensitivity to drugs induced by morphine and some related substances in the cat. Brit. J. Pharmacol. 39, 789?797 (1970).