@article {5781,
	title = {Languages evolve in punctuational bursts},
	journal = {Science},
	volume = {319},
	number = {5863},
	year = {2007},
	note = {PDF},
	pages = {588-589},
	keywords = {cultural evolution, language evolution, phylogenetics, punctuated equilibrium},
	author = {Atkinson, Quentin D. and Meade, Andrew and Venditti, Chris and Greenhill, Simon J. and Pagel, Mark}
}
