Raffield, Ben; Price, Neil; Collard, Mark. Male-biased operational sex ratios and the Viking phenomenon: an evolutionary anthropological perspective on Late Iron Age Scandinavian raiding. Evolution and Human Behavior. 2017-05-01, 38 (3): 315–24. ISSN 1090-5138. doi:10.1016/j.evolhumbehav.2016.10.013.
Raffield, Ben; Price, Neil; Collard, Mark. Male-biased operational sex ratios and the Viking phenomenon: an evolutionary anthropological perspective on Late Iron Age Scandinavian raiding. Evolution and Human Behavior. 2017-05-01, 38 (3): 315–24. ISSN 1090-5138. doi:10.1016/j.evolhumbehav.2016.10.013.