@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 {156,
	title = {Nitrogen critical loads for natural and semi-natural ecosystems: the empirical approach},
	journal = {Water, Air and Soil Pollution},
	volume = {85},
	year = {1995},
	pages = {2413-2418},
	author = {Bobbink, R. and Roelofs, J.G.M.}
}
@proceedings {222,
	title = {Nitrogen eutrophication and critical load for nitrogen based upon changes in flora and fauna in (semi)-natural terrestrial ecosystems},
	year = {1993},
	pages = {pp. 111-159},
	publisher = {Nordic Council of Ministers, Copenhagen, Denmark},
	address = {L{\"o}keberg, Sweden},
	author = {Bobbink, R. and Boxman, D. and Fremstad, E. and Heil, G. and Houdijk, A. and Roelofs, J.}
}
