@article {665936,
	title = {Statistical analysis of iron geochemical data suggests limited late Proterozoic oxygenation},
	journal = {Nature},
	volume = {523},
	number = {7561},
	year = {2015},
	pages = {451-454},
	author = {Sperling, E. A. and Wolock,C. and Morgan, A. S. and Gill, B.C. and Kunzmann, M. and Halverson, G. P. and Macdonald, Francis A. and Knoll, A.H. and Johnston, D. T.}
}
