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Guo D, Li H, Mitchell RJ, Han W, Hendricks JJ, Fahey TJ, Hendrick RL. Fine root heterogeneity by branch order:  exploring the discrepancy in root turnover estimates between minirhizotron and carbon isotopic methods.  2008;177:443-456.\par \par Hendricks JJ, Aber JD, Nadelhoffer KJ, Hallett RD. Nitrogen controls on fine root substrate quality in temperate forest ecosystems. Ecosystems. 2000;3:57-69.\par \par Hendricks JJ, Nadelhoffer KJ, Aber JD. A 15N tracer technique for assessing fine root production and turnover. Oecologia. 1997;112:300-304.\par \par Magill AH, Aber JD, Hendricks JJ, Bowden RD, Melillo JM, Steudler PA. Biogeochemical response of forest ecosystems to simulated chronic nitrogen deposition. Ecological Applications. 1997;7:402-415.\par \par Hendricks JJ, Nadelhoffer KJ, Aber JD. The role of fine roots in energy and nutrient cycling. Trends in Ecology and Evolution. 1993;8:174-178.\par \par }