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Tkaczynski, PJ, Mielke, A, Samuni, L, Preis, A, Wittig, RM and Crockford, C (2020) Long-term repeatability in social behaviour suggests stable social phenotypes in wild chimpanzees. Royal Society Open Science, 7 (8). ISSN 2054-5703

Sonnweber, R, Araya-Ajoy, YG, Behringer, V, Deschner, T, Tkaczynski, PJ, Fedurek, P, Preis, A, Samuni, L, Zommers, Z, Gomes, C, Zuberbühler, K, Wittig, RM and Crockford, C (2018) Circadian Rhythms of Urinary Cortisol Levels Vary Between Individuals in Wild Male Chimpanzees: A Reaction Norm Approach. Frontiers in Ecology and Evolution, 6 (85). ISSN 2296-701X