Vidon, Philippe, Hilary Hubbard, Pilar Cuadra, and Matthew Hennessy. 2012. “Storm NO<sub;>3< sub><sup>-< sup> and NH<sub;>4< sub><sup>+< Sup> Exports in Stream, Overland Flow, and Tile Drains of the US Midwest”. Annals of Environmental Science 6 (September). https://openjournals.neu.edu/aes/journal/article/view/v6art5.