@article {1517,
	title = {Contribution of acidification and eutrophication to declines in species richness of calcifuges grasslands along a gradient of atmospheric nitrogen deposition.},
	volume = {24},
	year = {2010},
	pages = {478-484},
	author = {Stevens, C.J. and Thompson, K. and Grime, J.P. and Long, C.J. and Gowing, D.J.G.}
}
@article {1302,
	title = {Nitrogen deposition causes widespread species loss in British Habitats},
	volume = {16},
	year = {2010},
	pages = { 671-679},
	author = {Maskell, L.C. and Smart, S.M. and Bullock, J.M. and Thompson, K. and Stevens, C.J.}
}
