Worrall, F., Burt, T., Howden, N., & Whelan, M. (2012). The fluvial flux of nitrate from the UK terrestrial biosphere – An estimate of national-scale in-stream nitrate loss using an export coefficient model. Journal of Hydrology, 414-415, 31-39. https://doi.org/10.1016/j.jhydrol.2011.09.020