@article {1346,
	title = {Low atmospheric nitrogen loads lead to grass encroachment in coastal dunes, but only on acid soils},
	journal = {Ecosystems},
	volume = {12},
	year = {2009},
	pages = {1173{\textendash}1188},
	author = {Remke, E. and Brouwer, E. and Kooijman, A. and Blindow, A. and Roelofs, J.G.M.}
}
@article {1305,
	title = {Stimulated growth of Betula pubescens and Molinia caerulea on ombrotrophic bogs: role of high levels of atmospheric nitrogen deposition},
	journal = {Journal of Ecology},
	volume = {91},
	year = {2003},
	pages = {357-370},
	author = {Tomassen, H.B.M. and Smolders, A.J.P. and Lamers,  L.P.M. and Roelofs, J.G.M.}
}
@article {547,
	title = {Differential effects of ammonium nitrate on three heathland species},
	journal = {Plant Ecology},
	volume = {135},
	year = {1998},
	pages = {185-196},
	author = {De Graaf, M.C.C. and Bobbink, R. and Roelofs, J.G.M. and Verbank, P.J.M.}
}
@article {223,
	title = {The effects of air-borne nitrogen pollutants on species diversity in natural and semi-natural European vegetation},
	journal = {Journal of Ecology},
	volume = {86},
	year = {1998},
	pages = {717-738},
	author = {Bobbink, R. and Hornung, M. and Roelofs, J.G.M.}
}
@article {1322,
	title = { Empirical nitrogen critical loads for natural and semi-natural ecosystems},
	year = {1996},
	pages = {71-96. },
	institution = {Umweltbundesamt},
	address = {Berlin},
	author = {Bobbink, R. and Hornung, M. and Roelofs, J.G.M.}
}
@article {159,
	title = {Empirical nitrogen critical loads: update since Lokeberg (1992)},
	year = {1995},
	pages = {9-19},
	institution = {Institute of Terrestrial Ecology},
	address = {Bush},
	author = {Bobbink, R. and Roelofs, J.G.M.},
	editor = {Hornung, M. and Sutton, M.A. and Wilson, R.B.}
}
@article {907,
	title = {Mapping and modelling of critical loads for nitrogen - a workshop report},
	year = {1995},
	pages = {9-19},
	institution = {Institute of Terrestrial Ecology},
	chapter = {Empirical nitrogen critical loads: update since Lokeberg (1992).},
	address = {Bush},
	author = {Bobbink, R. and Roelofs, J.G.M. and Hornung, M. (Eds) and Sutton, M.A. (Eds) and Wilson, R.B. [Eds.]}
}
@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.}
}
@article {1463,
	title = { Distribution and decline of endangered herbaceous heathland species in relation to the chemical composition of the soil},
	journal = {Plant and Soil},
	volume = {148},
	year = {1993},
	pages = {137-143},
	author = {Houdijk, A.L.F.M. and Verbank, P.J.M. and van Dijk, H.F.G. and Roelofs, J.G.M.}
}
@article {276,
	title = {Successional changes in the soft-water macrophyte vegetation of (sub)atlantic, sandy, lowland regions during this century},
	journal = {Freshwater Biology},
	volume = {24},
	year = {1990},
	pages = {287-294},
	author = {Arts, G.H.P. and Van der Velde, G. and Roelofs, J.G.M. and Van Swaay, C.A.M.}
}
@article {256,
	title = {Effects of excessive ammonium deposition on the nutritional status and condition of pine needles},
	journal = {Physiologia Plantarum},
	volume = {73},
	year = {1988},
	pages = {494-501},
	author = {van Dijk, H.F.G. and Roelofs, J.G.M.}
}
@article {1339,
	title = {The effects of air-borne ammonium sulphate on Pinus nigra in the Netherlands},
	journal = {Plant Soil},
	volume = {42},
	year = {1985},
	pages = {372{\textendash}377},
	author = {Roelofs, J.G.M. and Kempers, A.J. and Houdijk, A.L.F.M. and Jansen, J.}
}
@article {293,
	title = {Impact of acidification and eutrophication on macrophyte communities in soft waters in the Netherlands},
	journal = {Aquatic Botany},
	volume = {17},
	year = {1983},
	pages = {139-155},
	author = {Roelofs, J.G.M.}
}
