1. Interview with a Heroin Addict,2020
2. Conditioned Reflexes: an Investigation of the Physiological Activity of the Cerebral Cortex;Pavlov,1927
3. Sensory pre-conditioning;Brogden;J Exp Psychol,1939
4. Higher order conditioning with constant motivation;Finch;Am J Psychol,1934
5. Conditioned compensatory response to alcohol placebo in humans;Newlin;Psychopharmacology,1986