Wingate, L., Ogee, J., Cuntz, M., Genty, B., Reiter, I., Seibt, U., Yakir, D., Maseyk, K., Pendall, E. G., Barbour, M. M.,
Mortazavi, B., Burlett, R., Peylin, P., Miller, J., Mencuccini, M., Shim, J. H., Hunt, J., & Grace, J. (2009).
The impact of soil microorganisms on the global budget of δ 18O in atmospheric CO2.
Proceedings of the National Academy of Sciences of the United States of America, 106(52),
22411-22415. doi:10.1073/pnas.0905210106.