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7 Leip, A. Vries, W Achermann, B Billen, G Bleeker, A Bouwman, A.F Döring, U Geupel, M Johnes, P Le Gall, A.C. Monni, S Orlandini, L Prudhomme, M Simpson, D Spranger, T van Aardenne, J Winiwarter, W. 2010 European Nitrogen Assessment, Charper - Integrating nitrogen fluxes at the European scale. Cambridge University Press Chapter 16