@article {25058,
	title = {Confirmation of Romer{\textquoteright}s Gap as a low oxygen interval constraining the timing of initial arthropod and vertebrate terrestrialization},
	journal = {Proceedings of the National Academy of Sciences},
	volume = {103},
	number = {45},
	year = {2006},
	month = {2006},
	pages = {16818-16822},
	keywords = {REPRINT},
	author = {Ward, P and Conrad C. Labandeira and Laurin, M and Berner, R.A}
}
