Marrying women 15 years younger maximized men's evolutionary fitness in historical Sami

Helle S, Lummaa V & Jokela J
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Helle, S., Lummaa, V., & Jokela, J. (2008). Marrying women 15 years younger maximized men's evolutionary fitness in historical Sami. Biology Letters, 4(1), 75-77. https://doi.org/10.1098/rsbl.2007.0538