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\bibitem{Cools_etal2011} {\textquotedblleft}\textit{Coupling a hydrological water quality model and an economic optimization model to set up a cost-effective emission reduction scenario for nitrogen}{\textquotedblright}. Cools J, Broekx S, Vandenberghe V, Seuntjens P, ea, Environmental modelling and software \textbf{26}, 44 (2011).   http://doi.org/10.1016/J.ENVSOFT.2010.04.017

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