Journal of Comparative Psychology (2014) - Comment
pubmed: 24188621  doi: 10.1037/a0034567  issn: 1939-2087  issn: 0735-7036 

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Walter T. Herbranson, Yvan T. Trinh, Patricia M. Xi, Mark P. Arand, Michael S. K. Barker, Theodore H. Pratt