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Article Source: Ingroup-Outgroup Bias in Contagious Yawning by Chimpanzees Supports Link to Empathy
Campbell MW, de Waal FBM (2011) Ingroup-Outgroup Bias in Contagious Yawning by Chimpanzees Supports Link to Empathy. PLOS ONE 6(4): e18283. https://doi.org/10.1371/journal.pone.0018283

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