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Atmospheric oxygenation three billion years ago.
Crowe SA, Døssing LN, Beukes NJ, Bau M, Kruger SJ, Frei R, Canfield DE. Crowe SA, et al. Among authors: dossing ln. Nature. 2013 Sep 26;501(7468):535-8. doi: 10.1038/nature12426. Nature. 2013. PMID: 24067713