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31. Effects of relative reinforcer frequency on complex color detection. Davison M, McCarthy D. J Exp Anal Behav; 1989 May; 51(3):291-315. PubMed ID: 16812580 [Abstract] [Full Text] [Related]
32. Choice with certain and uncertain reinforcers in an adjusting-delay procedure. Mazur JE. J Exp Anal Behav; 1996 Jul; 66(1):63-73. PubMed ID: 8755700 [Abstract] [Full Text] [Related]