@article {6023,
	title = {Permian opinions. The Paleobiology Database},
	year = {2009},
	url = {http://pbdb.org/cgi-bin/bridge.pl?action=displayTaxonomicNamesAndOpinions\&reference_no=27487\&display=opinions [Last accessed on December 16, 2009]},
	author = {Clapham, Matthew E.}
}
