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Ellsworth, Ryan M.; Bailey, Drew H.; Hill, Kim R.; Hurtado, A. Magdalena; Walker, Robert S. (2014-10-01). "Relatedness, Co-residence, and Shared Fatherhood among Ache Foragers of Paraguay". Current Anthropology. 55 (5): 647–653. doi:10.1086/678324. hdl:2286/R.I.27078. ISSN0011-3204. S2CID41438731.