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 F.  Moldan, et al., ?Potential for deliberate management of element interactions to address major environmental issues?, in J. M. Melillo, C. B. Field, and B. Moldan (eds.). Interactions of the Major Biogeochemical Cycles: Global Change and Human Impacts, 2003, p. 93-114.\par \par  E. A.  Davidson, M.  Keller, H. E.  Erickson, and L. V.  Verchot, ?A cross-site test of a conceptual model of nitrous oxide and nitric oxide emissions from soils?, BioScience, vol. 50, p. 667-680, 2000.\par \par  L. V.  Verchot, E. A.  Davidson, J. H.  Catt\'e2nio, I. L.  Ackerman, H. E.  Erickson, and M.  Keller, ?Land-use change and biogeochemical controls of nitrogen oxide emissions from soils in eastern Amazonia?, Global Biogeochem. Cycles, vol. 13, p. 31-46, 1999.\par \par }