We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleAtmospheric oxygenation three billion years ago.AuthorsCrowe SA; Døssing LN; Beukes NJ; Bau M; Kruger SJ; Frei R; Canfield DEPublicationNature, 2013, Vol 501, Issue 7468, p535ISSN1476-4687Publication typearticleDOI10.1038/nature12426