1. Investigations on drug produced and subjectively experienced discriminative stimuli. 1. The fentanyl cue, a tool to investigate subjectively experienced narcotic drug actions;Colpaert;Life Sciences,1975
2. Theoretical and methodological considerations on drug discrimination learning;Colpaert;Psychopharmacologia,1976
3. Agonist and antagonist effects of prototype opiate drug in rats discrimination fentanyl from saline: characteristics of partial generalization;Colpaert;Journal of Pharmacology and of Experimental Therapeutics,1984