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Author (up) Title Year Publication Serial Volume Pages
Gray, E.R.; Spetch, M.L. Pigeons Encode Absolute Distance but Relational Direction From Landmarks and Walls 2006 Journal of Experimental Psychology: Animal Behavior Processes 2894 32 474-480
Kelly, D.M.; Spetch, M.L. Pigeons encode relative geometry 2001 Journal of Experimental Psychology. Animal Behavior Processes 2770 27 417-422