@article {Rosing:15 January 2004:0012-821X:237,
	author = "Rosing M.T.",
	author = "Frei R.",
	title = "U-rich Archaean sea-floor sediments from Greenland - indications of >3700 Ma oxygenic photosynthesis",
	journal = "Earth and Planetary Science Letters",
	volume = "217",
	year = "15 January 2004",
	abstract = "",
	pages = "237-244(8)",
	url = "http://www.ingentaconnect.com/content/els/0012821x/2004/00000217/00000003/art00609"
	doi = "doi:10.1016/S0012-821X(03)00609-5	"
}