@inbook {1676, title = {Nitrogen deposition as a threat to European Terrestrial Biodiversity}, booktitle = {European Nitrogen Assessment}, year = {2011}, pages = {463-494}, publisher = {Cambridge University Press}, organization = {Cambridge University Press}, chapter = {20}, author = {Dise, N.B. and Ashmore, M.R. and Belyazid S and Bleeker, A. and Bobbink, R. and de Vries, W. and Erisman, J.W. and Spranger, T. and Stevens, C.J. and Van Den Berg, L.J.L.} } @article {273, title = {Critical Loads for Sulphur and Nitrogen}, year = {1988}, institution = {Nordic Council of Ministers}, address = {Copenhagen}, author = {Nilsson, J. and Grennfelt, P.} }