Hobbie, E. A. Department Biogeochemical Systems, Prof. D. Schimel, Max Planck Institute for Biogeochemistry, Max Planck Society;
Hobbie, E. A., Macko, S. A., & Williams, M. (2000). Correlations between foliar δ 15N and nitrogen concentrations may indicate plant-mycorrhizal interactions. Oecologia, 122(2), 273-283. doi:10.1007/PL00008856.