@article {1559,
	title = {A review and application of the evidence for nitrogen impacts on ecosystem services.},
	volume = {7},
	year = {2014},
	pages = {76-88},
	author = {Jones, L. and Provins, A. and Harper-Simmonds, L. and Holland, M. and Mills, G. and Hayes, F. and Emmett, B.A. and Hall, J. and Sheppard, L.G. and Smith, R. and Sutton, M. and Hicks, K. and Ashmore, M. and Haines-Young, R.}
}
@article {1490,
	title = {Trends in the hydrochemistry of acid-sensitive surface waters in the UK 1988{\textendash}2008.},
	year = {2014},
	pages = {287-303},
	author = {Monteith, D.T. and Evans, C.D. and Henrys, P.A. and Simpson, G.L. and Malcolm, I.A.}
}
@article {1584,
	title = {Using the Ecosystems Services Approach to value air quality.},
	year = {2014},
	institution = {DEFRA},
	author = {Jones, M.L.M. and Provins, A. and Harper-Simmonds, L. and Holland, M. and Mills, G. and Hayes, F. and Emmett, B.A. and Hall, J. and Sheppard, L.J. and Smith, R. and Sutton, M. and Hicks, K. and Ashmore, M. and Haines-Young, R.}
}
@article {1569,
	title = {PK additions modify the effects of N dose and form on species composition, species litter chemistry and peat chemistry in a Scottish peatland.},
	volume = {116},
	year = {2013},
	pages = {39-53},
	author = {Sheppard, L.J. and Leith, I.D. and van Dijk, N. and Leeson, S. and Mizunuma, T. and De Bakker, R. and Elustando, D.E.V. and Gomez, H.G.}
}
@article {1325,
	title = {Impacts of atmospheric nitrogen deposition: responses of multiple plant and soil parameters across contrasting ecosystems in long-term field experiments},
	volume = {18},
	year = {2012},
	pages = {1197-1215},
	author = {Phoenix, G.K. and Emmett, B.A. and Britton, A.J. and Caporn, S.J.M. and Dise, N.B. and Helliwell, R. and Jones, M.L.M. and Leake, J.R. and Leith, I.D. and Sheppard, L.J. and Sowerby, A. and Pilkington, M.G. and Rowe, E.C. and Ashmore MR and Power, S.A.}
}
@article {1571,
	title = {Terricolous lichens as indicators of nitrogen deposition: Evidence from national records.},
	volume = {20},
	year = {2012},
	pages = {196-203},
	author = {Stevens, C.J. and Smart, S.M. and Henrys, P.A. and Maskell, L.C. and Crowe, A. and Simkin, J. and Cheffings, C.M. and Whitfield, C. and Gowing, D.J.G. and Rowe, E.C. and Dore, A.J. and Emmett, B.A.}
}
@article {1299,
	title = {Collation of evidence of nitrogen impacts on vegetation in relation to UK biodiversity objectives},
	year = {2011},
	institution = {JNCC},
	issn = {447},
	author = {Stevens, C.J. and Smart, S.M. and Henrys, P. and Maskell, L.C. and Walker, K.J. and Preston, C.D. and Crowe, A. and Rowe, E. and Gowing, D.J. and Emmett, B.A.}
}
@article {1563,
	title = {Evidence of widespread effects of ozone on crops and (semi-)natural vegetation in Europe (1990{\textendash}2006) in relation to AOT40- and flux-based risk maps.},
	volume = {17},
	year = {2011},
	pages = {592-613},
	author = {Mills, G. and Hayes, F. and Simpson, D. and Emberson, L. and Norris, D. and Harmens, H. and Buker, P.}
}
@article {1442,
	title = {Hydrochloric Acid: An Overlooked Driver of Environmental Change.},
	volume = {45},
	year = {2011},
	pages = {1887-1894},
	author = {Evans, C.D. and Monteith, D.T. and Fowler, D and Cape, J.N and Brayshaw, S.}
}
@article {1296,
	title = {Interpretation of evidence of nitrogen impacts on vegetation in relation to UK biodiversity objectives},
	number = {No. 449},
	year = {2011},
	institution = {JNCC},
	author = {Emmett, B.A. and Rowe, E.C. and Stevens, C.J. and Gowing, D.J. and Henrys, P.A. and Maskell, L.C. and Smart, S.M.}
}
@article {1488,
	title = {New stomatal flux-based critical levels for ozone effects on vegetation.},
	volume = {45},
	year = {2011},
	pages = {5064-5068},
	author = {Mills, G. and Pleijel, H. and Braun, S. and Buker, P. and Bermejo, V. and Calvo, E. and Danielsson, H. and Emberson, L. and Gonzalez Fernandez, I. and Grunhage, L. and Harmens, H. and Hayes, F. and Karlsson, P.E. and Simpson, D.}
}
@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 {1348,
	title = {Predicting effects of N pollutant load on plant species based on a dynamic soil eutrophication indicator},
	number = {977},
	year = {2011},
	pages = {39},
	institution = {Countryside Council for Wales},
	address = {Bangor},
	author = {Rowe, E.C. and Jones, M.L.M. and Henrys, P.A. and Smart, S.M. and Tipping, E. and Mills, R.T.E. and Evans, C.D.}
}
@article {1342,
	title = {UK Status Report July 2011: Update to empirical critical loads of nitrogen},
	year = {2011},
	pages = {55pp},
	author = {Hall, R.J. and Emmett, B. and Garbutt, A. and Jones, L and Rowe, E. and Sheppard, L and Vanguelova, E. and Pitman, R. and Britton, A. and Hester, A. and Ashmore, M. and Power, S. and Caporn, S.}
}
@article {1696,
	title = {Global assessment of nitrogen deposition effects on terrestrial plant diversity: a synthesis},
	volume = {20},
	year = {2010},
	pages = {30-59},
	keywords = {arctic polar semidesert, arctic-alpine ecosystems, atmospheric deposition, boreal ecosystems, critical loads, diversity, ecoregions, long-term, mediterranean ecosystems, n-deposition, nitrogen deposition, nutrient limitation, racomitrium-lanuginosum, simulated environmental-change, southern california, species richness, temperature ecosystems, terrestrial ecosystems, tropical ecosystems, western united-states},
	author = {Bobbink, R. and Hicks, K. and Galloway, J. and Spranger, T. and Alkemade, R. and Ashmore, M. and Bustamante, M. and Cinderby, S. and Davidson, E. and Dentener, F. and Emmett, B. and Erisman, J. W. and Fenn, M. and Gilliam, F. and Nordin, A. and Pardo, L. and de Vries, W.}
}
@article {1706,
	title = {Can small-scale experiments predict ecosystem responses? An example from peatlands},
	volume = {118},
	year = {2009},
	pages = {449-456},
	keywords = {atmospheric nitrogen deposition, boreal mire, carbon accumulation, climate-change, n deposition, ombrotrophic bogs, peat bogs, plant community, sphagnum litter, vegetation},
	author = {Wiedermann, M. M. and Gunnarsson, U. and Nilsson, M. B. and Nordin, A. and Ericson, L.}
}
@article {1345,
	title = {The effects of low levels of nitrogen deposition and grazing on dune grassland},
	volume = {407},
	year = {2009},
	pages = {1391-1404},
	author = {Plassmann, K. and Edwards-Jones, G. and Jones, M.L.M.}
}
@article {1347,
	title = {Even low to medium nitrogen deposition impacts vegetation of dry, coastal dunes around the Baltic Sea},
	volume = {157},
	year = {2009},
	pages = {792-800},
	author = {Remke, E. and Brouwer, E. and Kooijman, A.M. and Blindow, I. and Esselink, H. and Roelefs, J.G.M.}
}
@article {1110,
	title = {Shifts in lake N:P stoichiometry and nutrient limitation driven by atmospheric nitrogen deposition},
	volume = {5954},
	year = {2009},
	pages = {835-837},
	author = {Elser, J.J. and Anderson, T. and Baron, J.S. and Bergstorm, A.K. and Jansson, M. and Kyle, M. and Nydick, K.R. and Steger, L. and Hesson, D.O.}
}
@article {1491,
	title = {Dissolved organic carbon trends resulting from changes in atmospheric deposition chemistry.},
	volume = {450},
	year = {2007},
	pages = {537-539},
	author = {Monteith, D.T. and Stoddard, J.L. and Evans, C.D. and De Wit, H.A. and Forsius, M. and Hogasen, T. and Wilander, A. and Skjelkvale, B.L. and Jeffries, D.S. and Vuorenmaa, J. and Keller, B. and Kop{\'a}cek, J. and Vesely, J.}
}
@article {1350,
	title = {Global change shifts vegetation and plant-parasite interactions in a boreal mire},
	volume = {88},
	year = {2007},
	pages = {454-464},
	author = {Wiedermann, M.M. and Nordin, A. and Gunnarsson, U. and Nilsson, M.B. and Ericson, L.}
}
@article {1101,
	title = {The impacts of ozone on nature conservation },
	volume = {403},
	year = {2007},
	author = {Morrissey, T. and Ashmore, M.R. and Emberson, L.D. and Cinderby, S. and Buker, P.}
}
@article {1443,
	title = {Alternative explanations for rising dissolved organic carbon export from organic soils.},
	volume = {12},
	year = {2006},
	pages = {2044-2053},
	author = {Evans, C.D. and Chapman, P.J. and Clark, J.M. and Monteith, D.T. and Cresser, M.S.}
}
@article {1502,
	title = {Differential ozone sensitivity in an old and a modern Swedish wheat cultivar {\textendash} grain yield and quality, leaf chlorophyll and stomatal conductance.},
	volume = {56},
	year = {2006},
	pages = {63-71},
	author = {Pleijel, H. and Eriksen, A.B. and Danielsson, H. and Bondesson, N. and Sellden, G.}
}
@article {1549,
	title = {Nitrogen saturation in UK moorlands: the critical role of bryophytes and lichens in determining retention of atmospheric N deposition.},
	volume = {42},
	year = {2005},
	pages = {507-517},
	author = {Curtis, C.J. and Emmett, B.A. and Grant, H. and Kernan, M. and Reynolds, B. and Shilland, E.}
}
@article {1114,
	title = {Recovery from acidification in the UK: Evidence from 15 years of acid waters monitoring},
	volume = {137},
	year = {2005},
	pages = {1-177.},
	author = {Monteith, D.T. and Evans, C.D.}
}
@article {1102,
	title = {Changes in vegetation and soil characteristics in coastal sand dunes along a gradient of atmospheric nitrogen deposition},
	volume = {6},
	year = {2004},
	pages = {598-605},
	author = {Jones, M.L.M. and Wallace, H.L. and Norris, D. and Brittain, S.A. and Haria, S. and Jones, R.E. and Rhind, P.M. and Reynolds, B.R. and Emmett, B.A.}
}
@article {773,
	title = {Parasitic fungus mediates change in nitrogen-exposed boreal forest vegetation.},
	volume = {90},
	year = {2002},
	pages = {61},
	author = {Stengbom, J. and Nordin, A. and N{\"a}sholm, T. and Ericson, L.}
}
@article {50,
	title = {Accumulation of perfluorooctane sulfonate in marine mammals},
	journal = {Environmental Science and Technology},
	volume = {35},
	year = {2001},
	pages = {1593-1598},
	author = {Kannan, K and Koistinen, J. and Beckmen, K and Evans, T. and Gorzelany, J.F. and Hansen, K.J. and Jones, P.D. and Helle, E. and Nyman, M. and Giesy, J.P.}
}
@article {781,
	title = {Biosphere-atmosphere interactions of ammonia with grasslands: experimental strategy and results from a new European initiative},
	volume = {228 (1)},
	year = {2001},
	pages = {131-145},
	author = {Sutton, M.A. and Milford, C. and Nemitz, E. and Theobald, M.R. and Fowler D. and Schjoerring, J.K. and Mattsson, M.E. and Nielsen, K.H. and Husted, S. and Erisman, J.W. and Oties, R. and Hensen, A. and Mosquera, J. and Cellier, P. and Loubert, B. and David, M. and Genermont, S. and Neftel, A. and Blatter, A. and Herrmann, B. and Jones, S.K. and Horvath, L. and Flhrer, E. and Mantzanas, K. and Koukoura, Z. and Gallagher, M. and Williams, P. and Flynn, M. and Riedo, M.}
}
@article {1319,
	title = {Slow recovery of boreal forest ecosystem following decreased nitrogen input},
	volume = {15},
	year = {2001},
	pages = {451-457},
	author = {Strengbom, J. and Nordin, A. and N{\"a}sholm, T. and Ericson, L.}
}
@article {777,
	title = {Slow recovery of boreal forest ecosystem following decreased nitrogen input. },
	volume = {15},
	year = {2001},
	pages = {451-457},
	author = {Strengbom, J. and Nordin, A. and Ndsholm, T. and Ericson, L.}
}
@article {1137,
	title = {Assessing the chronic effects of atmospheric tetrachloroethylene (PER) on plants. Note 48},
	year = {2000},
	publisher = {Wageningen},
	address = {Netherlands},
	author = {Franzaring, J. and Van der Eerden, L.J.M. and Van Dijk, C.J. and Helsper J.P.F.G. and Pikaar P.J.J. and Nijhuis E.H. and Tonneijck A.E.G.}
}
@article {826,
	title = {Bryophyte biomass and species richness on the Park Grass Experiment, Rothamsted, UK. },
	volume = {151},
	year = {2000},
	pages = {129-141},
	author = {Virtanen, R. and Johnson, A.E. and Crawley, M.J. and Edwards, G.R.}
}
@article {1120,
	title = {Nitrogen deposition and effects in European forests.},
	volume = {8},
	year = {2000},
	pages = {65-93},
	author = {Erisman, J.W. and de Vries, W.}
}
@article {1425,
	title = {Seasonal ozone response of mature beech trees (Fagus sylvatica) at high altitude in the Bavarian Forest (Germany) in comparison with young beech grown in the field and in phytotrons.},
	volume = {109},
	year = {2000},
	pages = {431-442},
	author = {Baumgarten, M. and Werner, H and Haberle, K.H. and Emberson, L.D. and Fabian, P. and Matyssek, R.}
}
@article {686,
	title = {UK Acid Waters Monitoring Network: 10 Year Report},
	year = {2000},
	publisher = {ENSIS Publishing},
	address = {London},
	url = {http://awmn.defra.gov.uk/resources/publications/2000publications.php},
	author = {Monteith, D.T. and Evans, C.D.}
}
@article {298,
	title = {Factors influencing nitrogen saturation in forest ecosystems: Advances in our understanding since the mid 1980s. in the impact of nitrogen deposition on natural and semi-natural ecosystems},
	year = {1999},
	address = {Dordrecht, NL},
	author = {Wilson, E.J. and Emmett, B.A.}
}
@article {2022,
	title = {The influence of wooded shelterbelts on the deposition of copper, lead and zinc at Shakerley Mere, Cheshire, England},
	year = {1999},
	pages = {415-417},
	author = {Heath, B. A and Maughan, J. A and Morrison, A. A and Eastwood, I. W}
}
@article {971,
	title = {Nitrogen deposition makes a minor contribution to carbon sequestration in temperate forests.},
	volume = {398},
	year = {1999},
	pages = {145-148},
	author = {Nadelhoffer and Emmett, B.A. and Gundersen, P. and Kjonaas, O.J. and Koopmans, C.J. and Schleppi, P. and Tietema, A. and Wright, R.F.}
}
@article {563,
	title = {Air pollution fades the plumage of the Great Tit},
	volume = {12},
	year = {1998},
	pages = {607-612},
	author = {Eeva, T. and Lehikoinen E. and Rvnkd, M.}
}
@article {566,
	title = {Assessment of the exposure and loads of acidifying and eutrophying pollutants and ozone, as well as their harmful influence on the vitality of the trees and the speulder forest ecosystem as a whole.},
	volume = {105},
	year = {1998},
	pages = {539-571},
	author = {Erisman, J.W. and Draaijers, G.P.J. and Steingr{\"o}ver, E. and Van Dijk, H. and de Vries, W. and Boxman, A.}
}
@article {22,
	title = {Dispersion, deposition and impacts of atmospheric ammonia: quantifying local budgets and spatial variability},
	journal = {Environmental Pollutution (Nitrogen Conference Special Issue)},
	volume = {102},
	year = {1998},
	pages = {349-361},
	chapter = {1},
	author = {Sutton, M.A. and Milford, C. and Dragosits, U. and Place, C.J. and Singles, R.J. and Smith, R.I. and Pitcairn, C.E.R. and Fowler, D. and Hill, J. and ApSimon, H.M. and Ross, C. and Hill, R. and Jarvis, S.C. and Pain, B.F. and Phillips, V.C. and Harrison, R. and Moss, D. and Webb, J. and Espenhahn, S.E. and Lee, D.S. and Hornung, M. and Ullyett, J. and Bull, K.R. and Emmett, B.A. and Lowe, J. and Wyers, G.P.}
}
@article {174,
	title = {Effects of ammonia deposition on forests in the Netherlands},
	journal = {Atmospheric Environment},
	volume = {32(3)},
	year = {1998},
	pages = {525-532},
	author = {van der Eerden, L. and de Vries, W. and van Dobben, H.}
}
@article {242,
	title = {Effects of simulated N deposition on understorey vegetation of a boreal coniferous forest.},
	journal = {Functional Ecology},
	volume = {12},
	year = {1998},
	pages = {691-699},
	author = {Nordin, A. and N{\"a}sholm, T. and Ericson, L.}
}
@article {267,
	title = {Impacts of global change on UK species and communities},
	year = {1998},
	pages = {98-103},
	institution = {Institute of Terrestrial Ecology},
	author = {Hill, M.O. and Ashenden, T.W. and Buse, A. and Elmes, G.W. and Goss-Custard, J.D. and Thomas, J.A.}
}
@article {560,
	title = {Local survival rates of the pied flycatchers (Ficedula hypoleuca) and the great tits (Parus major) in an air pollution gradient},
	volume = {5},
	year = {1998},
	pages = {46-50},
	author = {Eeva, T. and Lehikoinen E.}
}
@article {71,
	title = {National Recommended Water Quality Criteria},
	journal = {Federal Register},
	volume = {63},
	year = {1998},
	pages = {68354-68364},
	author = {US EPA}
}
@article {1337,
	title = {Natural abundance of 15N in forests across a nitrogen deposition gradient},
	volume = {101},
	year = {1998},
	pages = {9{\textendash}18},
	author = {Emmett, B.A. and Kj{\o}naas, O.J. and Gundersen, P. and Koopmans, C.J. and Tietema, A. and Sleep, D.}
}
@article {278,
	title = {The nitrogen content of upland rivers in Britain: the significance of organic N},
	journal = {IAHS Publ.},
	volume = {248},
	year = {1998},
	pages = {443-450},
	author = {Chapman, P.J. and Edwards, A.C. and Reynolds, C. and Cresser, M. and Neal, C.}
}
@article {561,
	title = {Pollution - Recovery of breeding success in wild birds. },
	volume = {403},
	year = {1998},
	pages = {851-852},
	author = {Eeva, T. and Lehikoinen E.}
}
@article {45,
	title = {Urban Air Pollution and Cardiopulmonary Ill-Health - A 14.5 Year Time Series Study},
	journal = {Occup. Environ. Med.},
	volume = {55},
	year = {1998},
	pages = {697-704},
	author = {Prescott, G.J and Cohen, G.R and Elton, R.A. and Fowkes, F.G.R. and Agius, R.M.}
}
@inbook {1465,
	title = {Emission, concentration and deposition of acidifying substances.},
	booktitle = {Studies in Environmental Science},
	year = {1997},
	pages = {21-81},
	author = {Erisman, J.W. and Bleeker, A.}
}
@article {1148,
	title = {Guidance for Operators and Inspectors of IPC Processes, Best Practicable Environmental Option Assessments for Integrated Pollution Control},
	year = {1997},
	institution = {Environment Agency.},
	address = {London},
	author = {EA}
}
@article {564,
	title = {The influence of nitrogen fertilization on the carbon economy of Paxillus involutus in ectomycorrhizal association with Betula pendula},
	volume = {135},
	year = {1997},
	pages = {133-142},
	author = {Ek, H.}
}
@article {562,
	title = {Pollution-related variation in food supply and breeding success in two hole-nesting passerines.},
	volume = {78},
	year = {1997},
	pages = {1120-1131},
	author = {Eeva, T. and Lehikoinen E. and Pohjalainen, T.}
}
@article {702,
	title = {Thinner eggshells of dipper (Cinclus cinclus) eggs from an acidified area compared to a non-acidified area in Norway},
	volume = {93},
	year = {1997},
	pages = {255-266},
	author = {Nybx, S. and Staurnes, M. and Erstad, K.J.}
}
@article {196,
	title = {Acid rain research: Do we have enough answers?},
	year = {1995},
	institution = {Elsevier},
	address = {Amsterdam},
	author = {Heij, G.J.},
	editor = {Erisman, J.W.}
}
@article {21,
	title = {Assessment of the magnitude of ammonia emissions in the United Kingdom.},
	journal = {Atmospheric Environment},
	volume = {29},
	year = {1995},
	pages = {1393-1411},
	author = {Sutton, M.A. and Place, C.J. and Eager, M. and Fowler, D. and Smith, R.I.}
}
@article {474,
	title = {Nutrient balance in Scots Pine Forest I: Design of experiments},
	volume = {85},
	year = {1995},
	pages = {1125-1130},
	author = {Abrahamsen, G. and Erstad, K.J.}
}
@article {193,
	title = {Studies in Environmental Science 63},
	year = {1995},
	institution = {Elsevier},
	address = {Amsterdam},
	author = {Erisman, J.W. and Draaijers, G.P.J.}
}
@article {241,
	title = {Accumulation of amino acids in some boreal forest plants in response to increased nitrogen availability},
	journal = {New Phytologist},
	volume = {126},
	year = {1994},
	pages = {137-143},
	author = {N{\"a}sholm, T. and Edfast, A-B. and Ericsson, A. and Nord{\'e}n, L-G.}
}
@article {908,
	title = {Transboundary Air Pollution},
	year = {1994},
	institution = {Institute of Terrestrial Ecology},
	address = {Edinburgh},
	author = {Working Group for Effects}
}
@article {558,
	title = {Ectomycorrhizal colonisation of loblolly pine seedlings during three growing seasons in response to ozone, acidic precipitation and soil Mg status},
	volume = {76},
	year = {1992},
	pages = {71-77},
	author = {Edwards, G.S. and Kelly, J.M.}
}
@article {501,
	title = {Effect of an experimentally applied increase in ammonium on growth and amino-acid metabolism of Sphagnum cuspidatum Ehrh. Ex. Hoffm. From differently polluted areas. },
	volume = {120},
	year = {1992},
	pages = {265-274},
	author = {Baxter, R. and Emes, M.J. and Lee, J.A.}
}
@book {889,
	title = {Acid Rain - Critical and Target Load Maps for the United Kingdom},
	year = {1991},
	publisher = {Department of the Environment Air Quality Division},
	organization = {Department of the Environment Air Quality Division},
	address = {London},
	author = {Department of the Environment}
}
@article {559,
	title = {Influence of NH3 and (NH4)2SO4 on heathland vegetation},
	volume = {40},
	year = {1991},
	month = {281-297},
	author = {van der Eerdern, L.J. and Dueck, Th.A. and Berdowski, J.J.M. and Greven, H. and van Dobben, H.F.}
}
@article {555,
	title = {Nitrogen Uptake and Allocation by Calluna-Vulgaris (L) Hull and Deschampsia-Flexuosa (L) Trin Exposed to 15NH3},
	volume = {40},
	year = {1991},
	pages = {257-267},
	author = {Dueck, T.A. and Van der Eerden, L.J.M. and Beemsterboer, B. and Elderson, J.}
}
@article {227,
	title = {Zeigerwerte von Pflanzen in Mitteleuropa},
	journal = {Scripta Geobotanica},
	volume = {18},
	year = {1991},
	pages = {1-248},
	author = {Ellenberg, H. and Weber, H.E. and Dull, R. and Wirth, V. and Werner, W. and Pauli{\ss}en, D.}
}
@article {1866,
	title = {Boron hazards to fish, wildlife, and invertebrates:  a synoptic review},
	year = {1990},
	institution = {USDI Fish and Wildlife Service: 106},
	address = {Washington, DC},
	author = {Eisler, R.}
}
@article {565,
	title = {Phosphorus and nitrogen limitation of phytoplankton growth in the freshwaters of North America: a review and critique of experimental enrichments},
	volume = {47},
	year = {1990},
	pages = {1468-1477},
	author = {Elser, J.J. and Marzolf, E.R. and Goldman, C.R.}
}
@article {240,
	title = {Seasonal changes in amino acids, protein and total nitrogen in needles of fertilised Scots pine trees},
	journal = {Tree Physiology},
	volume = {6},
	year = {1990},
	pages = {267-281},
	author = {N{\"a}sholm, T. and Ericsson, A.}
}
@article {640,
	title = {The variation in the acidity of ground and surface waters in Northern Ireland},
	volume = {75},
	year = {1990},
	pages = {379-401},
	author = {Jordan, C. and Enlander, I. J.}
}
@article {1927,
	title = {Lead hazards to fish, wildlife and invertebrates: a synoptic review},
	number = {134},
	year = {1989},
	institution = {U.S. Department of the Interior, Fish and Wildlife ServicePublisher location:Laurel, MD},
	author = {Eisler, R}
}
@article {1895,
	title = {Chromium hazards to fish, wildlife, and invertebrates:  a synoptic review},
	year = {1986},
	author = {Eisler, R}
}
@article {1494,
	title = {Effect of Stream Acidification on Periphyton Composition, Chlorophyll, and Productivity.},
	volume = {43},
	year = {1986},
	pages = {1846-1858},
	author = {Mulholland, P.J. and Elwood, J.W. and Palumbo, A.V. and Stevenson, R.J.}
}
@article {556,
	title = {Vesicular-Arbuscular Mycorrhizae Decrease Zinc-Toxicity to Grasses Growing in Zinc-Polluted Soil. },
	volume = {18},
	year = {1986},
	pages = {331-333},
	author = {Dueck, T.A. and Visser, P. and Ernst, W.H.O. and Schat, H.}
}
@article {1873,
	title = {Cadmium hazards to fish, wildlife, and invertebrates:  a synoptic review},
	year = {1985},
	author = {Eisler, R}
}
@article {1926,
	title = {Ambient Water Quality Criteria for copper},
	number = {84},
	year = {1984},
	institution = {Environmental Protection Agency},
	address = {Washington, DC},
	author = {US EPA}
}
@article {226,
	title = {Indicator values of vascular plants in Central Europe},
	journal = {Scripta Geobotanica},
	volume = {9},
	year = {1979},
	pages = {7-122},
	author = {Ellenberg, H.}
}
@article {1840,
	title = {In depth studies on the health and environmental impacts of selected water pollutants},
	year = {1978},
	institution = {United States Environment Protection Agency},
	author = {US EPA}
}
@article {1890,
	title = {Metal toxicity to embryos and larvae of seven freshwater fish species - 1.Cadmium},
	year = {1978},
	pages = {95-103},
	author = {Eaton, J. G and McKim, J. M and Holcombe, G. W}
}
@article {1968,
	title = {Acute toxicities of Cd2+, Cr+6, Hg2+, Ni2+ and Zn2+ to estuarine macrofauna},
	year = {1977},
	pages = {315-323},
	author = {Eisler, R and Hennekey, R. J}
}
@article {314,
	title = {Results of the Tees-side investigation},
	number = {Report AERE-R6983},
	year = {1972},
	institution = {Harwell Laboratory},
	address = {Didcot, Oxon, UK},
	author = {Eggleston, A.E.J. and Atkins, D.H.F.}
}
@article {1519,
	title = {Suppression of plant growth by nitrogen dioxide.},
	volume = {41},
	year = {1966},
	pages = {132-135},
	author = {Taylor, O.C. and Eaton, F.M.}
}
@article {229,
	title = {Lichens as indicators of air pollution in the Tyne Valley},
	year = {1965},
	pages = {pp35-49},
	author = {Gilbert, O.L.},
	editor = {Goodman, G.T. and Edwards, R.W. and Lambert, J.M.}
}
