@book{145451,
	author = {Xu, Guirong. and Grant, Richard E.},
	title = {Brachiopods near the Permian-Triassic boundary in South China},
	publisher = {Smithsonian Institution Press},
	year = {1994.},
	series = {Smithsonian contributions to paleobiology},
	address = {Washington, D.C.}
}