W. Nelson
Groffman, Peter M., G. Howard, Arthur J. Gold, and W. M. Nelson. 1996. “Microbial Nitrate Processing In Shallow Groundwater In A Riparian Forest”. J. Environ. Qual. 25: 1309-1316.
Nelson, W. M., Arthur J. Gold, and Peter M. Groffman. 1995. “Spatial And Temporal Variation In Groundwater Nitrate Removal In A Riparian Forest”. J. Environ. Qual. 24: 691-699.