@article {6379,
	title = {Punctuated equilibria: the tempo and mode of evolution reconsidered},
	journal = {Paleobiology},
	volume = {3},
	number = {2},
	year = {1977},
	note = {PDF},
	pages = {115-151},
	keywords = {punctuated equilibrium},
	author = {Gould, S. J. and Eldredge, Niles}
}
