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P. R. Carnegie , J. R. Smythies , E. A. Caspary , and E. J. Field (1972). Interaction of hallucinogenic drugs. Nature, 240, 561–563.
S. S. Kety (1972). Brain catecholamines, affective states and memory. In The Chemistry of Mood, Motivation, and Memory, pp. 65–80. Edited by J. L. McGaugh . Plenum: New York.