@article {7707,
	title = {Incumbency, diversity, and latitudinal gradients},
	journal = {Paleobiology},
	volume = {34},
	number = {2},
	year = {2008},
	note = {PDF},
	pages = {169{\textendash}178},
	keywords = {biogeography, diversification, macroevolution},
	author = {Valentine, James W. and Jablonski, David and Krug, Andrew Z. and Roy, Kaustuv}
}
