7 Winiwarter, W Hettelingh, J.P Bouwman, A.F de Vries, W Erisman, J.W Galloway, J Hopkins, A Klimont, Z Leach, A Palliere, C Schneider, U Spranger, T Sutton, M.A Witzke, P 2010 European Nitrogen Assessment, Chapter - Future scenarios of nitrogen in Europe Cambridge University Press Chapter 24