DD Morrall

Factors affecting ammonium uptake in streams – an inter-biome perspective
Webster, J.R., P.J. Mulholland, J.L. Tank, H.M. Valett, Walter K. Dodds, B.J. Peterson, W.B. Bowden, et al. 2003. “Factors Affecting Ammonium Uptake in Streams – an Inter-Biome Perspective”. Freshwater Biology 48 (8): 1329-52. doi:10.1046/j.1365-2427.2003.01094.x.
Control of nitrogen export from watersheds by headwater streams
Peterson, B.J., WM Wollheim, P.J. Mulholland, J.R. Webster, J.L. Meyer, J.L. Tank, E. Marti, et al. 2001. “Control of Nitrogen Export from Watersheds by Headwater Streams”. Science 292 (5514): 86-90. doi:10.1126/science.1056874.