@article {6295,
	title = {When bivalves took over the world},
	journal = {Paleobiology},
	volume = {33},
	number = {3},
	year = {2007},
	note = {PDF},
	pages = {397-413},
	keywords = {bivalvia, ecology, escalation, mass extinction, paleoecology, permian, triassic},
	author = {Fraiser, Margaret L. and Bottjer, David J.}
}
