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Observing responses and informative stimuli.
Wilton RN, Clements RO. Wilton RN, et al. Among authors: clements ro. J Exp Anal Behav. 1971 Mar;15(2):199-204. doi: 10.1901/jeab.1971.15-199. J Exp Anal Behav. 1971. PMID: 16811502 Free PMC article.