A comparative analysis of the categorization of multidimensional stimuli: II. Strategic information search in humans (Homo sapiens) but not in pigeons (Columba livia)
Journal of Comparative Psychology (2009) - Comment
pubmed: 19929109  doi: 10.1037/a0016851  issn: 1939-2087  issn: 0735-7036 

Stephen E. G. Lea, Andy J. Wills, Lisa A. Leaver, Catriona M. E. Ryan, Catherine M. L. Bryant, Louise Millar