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Escape from freedom: Choosing not to choose in pigeons.
Hayes SC, Kapust J, Leonard SR, Rosenfarb I. Hayes SC, et al. Among authors: kapust j. J Exp Anal Behav. 1981 Jul;36(1):1-7. doi: 10.1901/jeab.1981.36-1. J Exp Anal Behav. 1981. PMID: 16812226 Free PMC article.