@article {6222,
	title = {Stability, diversity, and speciation in Paleozoic epeiric seas},
	journal = {Journal of Paleontology},
	volume = {48},
	number = {3},
	year = {1974},
	note = {PDF},
	month = {May},
	pages = {540-548},
	keywords = {evolution, punctuated equilibrium, speciation, stasis, trilobita},
	author = {Eldredge, Niles}
}
