Walker, J., Bell, M. D., Schwede, D., Cole, A., Beachley, G., Lear, G., & Wu, Z. (2019). Aspects of uncertainty in total reactive nitrogen deposition estimates for North American critical load applications. Sci Total Environ.

Walker, John, Michael D. Bell, Donna Schwede, Amanda Cole, Greg Beachley, Gary Lear, και Zhiyong Wu. "Aspects of Uncertainty in Total Reactive Nitrogen Deposition Estimates for North American Critical Load Applications." Sci Total Environ 2019.

Walker, John, et al. "Aspects of Uncertainty in Total Reactive Nitrogen Deposition Estimates for North American Critical Load Applications." Sci Total Environ 2019.