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Turnbull, J. C., Miller J. B., Lehman S. J., Tans P. P., Sparks R. J., & Southon J.  (2006).??Comparison of (CO2)-C-14, CO, and SF6 as tracers for recently added fossil fuel CO2 in the atmosphere and implications for biological CO2 exchange.  \ul Geophysical Research Letters. 33,\ul0  \par \par }