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3. Substitution effects in a generalized token economy with pigeons. Andrade LF, Hackenberg TD. J Exp Anal Behav; 2017 Jan; 107(1):123-135. PubMed ID: 28000221 [Abstract] [Full Text] [Related]
4. Pigeons' demand and preference for specific and generalized conditioned reinforcers in a token economy. Tan L, Hackenberg TD. J Exp Anal Behav; 2015 Nov; 104(3):296-314. PubMed ID: 26676183 [Abstract] [Full Text] [Related]