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  1. 1
    Ingroup-outgroup bias in contagious yawning by chimpanzees supports link to empathy.

    Ingroup-outgroup bias in contagious yawning by chimpanzees supports link to empathy. by Matthew W Campbell, Frans B M de Waal

    Published 2011-04-01
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  2. 2
    Ape duos and trios: spontaneous cooperation with free partner choice in chimpanzees

    Ape duos and trios: spontaneous cooperation with free partner choice in chimpanzees by Malini Suchak, Timothy M. Eppley, Matthew W. Campbell, Frans B.M. de Waal

    Published 2014-06-01
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