Zimmermann, R. Department Biogeochemical Systems, Prof. M. Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society;
Mcdonald, K. C., Zimmermann, R., & Kimball, J. S. (2002). Diurnal and spatial variation of xylem dielectric constant in Norway spruce (Picea abies [L.] Karst.) as related to microclimate, xylem sap flow, and xylem chemistry. IEEE Transactions on Geoscience and Remote Sensing, 40(9), 2063-2082.