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Author  |
Title | Year | Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| 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 |