@article {2890,
	title = {Ritual Human Sacrifice Promoted and Sustained the Evolution of Stratified Societies},
	journal = {Nature},
	volume = {532},
	year = {2016},
	pages = {228-231},
	author = {Watts, Joseph and Sheehan, Oliver and Atkinson, Quentin D. and Bulbulia, Joseph and Gray, Russell D.}
}
