Journal of Comparative Psychology (2013) - Comment
pubmed: 22545763  doi: 10.1037/a0027936  issn: 1939-2087  issn: 0735-7036 

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Eldin Jašarević, Drew H. Bailey, Janet P. Crossland, Wallace D. Dawson, Gabor Szalai, Mark R. Ellersieck, Cheryl S. Rosenfeld, David C. Geary