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↑ https://doi.org/10.11247/jssdj.55.45_2
↑ Schmidt, P.; Blessing, M.; Rageot, M.; Iovita, R.; Pfleging, J.; Nickel, K. G.; Righetti, L.; Tennie, C. (2019). “Birch tar production does not prove Neanderthal behavioral complexity”. Proceedings of the National Academy of Sciences 116 (36): 17707–17711. doi:10.1073/pnas.1911137116. PMC 6731756. PMID 31427508. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6731756/.
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