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  Author (up) Title Year Publication Serial Volume Pages Links
Beran, M.J.; Beran, M.M.; Harris, E.H.; Washburn, D.A. Ordinal judgments and summation of nonvisible sets of food items by two chimpanzees and a rhesus macaque 2005 Journal of Experimental Psychology. Animal Behavior Processes 2766 31 351-362 details   doi
Harris, E.H.; Washburn, D.A. Macaques' (Macaca mulatta) use of numerical cues in maze trials 2005 Animal Cognition 2498 8 190-199 details   doi
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