http://www.pnas.org/cgi/reprint/104/32/13046?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=chimpanzees&searchid=1&FIRSTINDEX=0&resourcetype=HWCIT
http://www.journals.royalsoc.ac.uk/content/laydchhajm1ybmew/fulltext.pdf
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