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Johnston, C. A., Groffman, P., Breshears, D. D., Cardon, Z. G., Currie, W., Emanuel, W., Gaudinski, J., Jackson, R. B., Lajtha, K., Nadelhoffer, K., Nelson, D., Post, W. M., Retallack, G., & Wielopolski, L. (2004). carbon cycling in soil. Frontiers in ecology and the environment, 2(10), 522–528. http://access.bl.uk/ark:/81055/vdc_100028655113.0x000003