Complexity in object manipulation by Japanese macaques (Macaca fuscata): a cross-sectional analysis of manual coordination in stone handling patterns
Journal of Comparative Psychology (2011) - Comment
pubmed: 21244141  doi: 10.1037/a0020868  issn: 1939-2087  issn: 0735-7036 

Jean-Baptiste Leca, Noëlle Gunst, Michael Huffman