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Author Title (down) Year Publication Serial Volume Pages
Massen, J.; Sterck, E.; de Vos, H. Close social associations in animals and humans: functions and mechanisms of friendship 2010 Behaviour 5813 147 1379
Silk, J.; Cheney, D.; Seyfarth, R. A practical guide to the study of social relationships 2013 Evolutionary Anthropology: Issues, News, and Reviews 5748 22 213-225