@article {2896,
	title = {Does Horizontal Transmission Invalidate Cultural Phylogenies?},
	journal = {Proceedings of the Royal Society of London B: Biological Sciences},
	volume = {276},
	year = {2009},
	pages = {2299-2306},
	author = {Greenhill, Simon J. and Currie, Thomas E. and Gray, Russell D.}
}
