@article {1702,
	title = {Inertia in an ombrotrophic bog ecosystem in response to 9 years{\textquoteright} realistic perturbation by wet deposition of nitrogen, separated by form.},
	journal = {Global Change Biology},
	volume = {20},
	year = {2014},
	pages = {566-580},
	keywords = {ammonium, atmospheric nitrogen, boreal mire, calluna, calluna-vulgaris, chronology, cover, critical loads, dry heathland, field manipulation, global change, growth, n deposition, nitrate, peatland, plant, sphagnum bogs, sphagnum capillifolium, vegetation},
	author = {Sheppard, L. J. and Leith, I. D. and Mizunuma, T. and Leeson, S. and Kivimaki, S. and Cape, J. N. and van Dijk, N. and Leaver, D. and Sutton, M. A. and Fowler, D. and Van den Berg, L. J. L. and Crossley, A. and Field, C. and Smart, S.}
}
@article {1703,
	title = {Reduced nitrogen has a greater effect than oxidised nitrogen on dry heathland vegetation},
	journal = {Environmental Pollution},
	volume = {154},
	year = {2008},
	pages = {359-369},
	keywords = {acidification, amino acids, ammonium toxicity, competition, decline, deposition, grass encroachment, herbaceous species, mesocosins, n enrichiuent, netherlands, nh4+/no3- ratios, nitrate, pinus-nigra, soil, vascular plants},
	author = {Van den Berg, L. J. L. and Peters, C. J. H. and Ashmore, M. R. and Roelofs, J. G. M.}
}
