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Röthlisberger, R.; Bigler, M.; Wolff, E. W.; Joos, F.; Monnin, E.; Hutterli, M. A. (2004). Ice core evidence for the extent of past atmospheric CO2 change due to iron fertilisation. Geophysical Research Letters, 31(16) American Geophysical Union 10.1029/2004GL020338
