F Stuart Chapin III, G. M Woodwell, J. T Randerson, Edward B Rastetter, Gary M Lovett, D. D Baldocchi, D. A Clark, J. D Aber, et al.. “Reconciling Carbon-Cycle Concepts, Terminology, And Methods”. Ecosystems 9, no. 7. Ecosystems (2006): 1041-1050. doi:10.1007/s10021-005-0105-7.