@article {605,
	title = {Development of Site Relevant Critical Loads},
	year = {2011},
	institution = {Scotland and Northern Ireland Forum for Environmental Research},
	abstract = {As part of a larger body of work on APIS, this project developed an updated, extended, and improved Site-Relevant Critical Loads tool and user-friendly interface to this tool.},
	keywords = {air, air quality, assessment, critical, ecosystem, GUI, habitat, pollutant, pollution, risk},
	issn = {ER04},
	author = {SNIFFER}
}
@article {1708,
	title = {Detecting changes in epiphytic lichen communities at sites affected by atmospheric ammonia from agricultural sources},
	volume = {38},
	year = {2006},
	pages = {161-176},
	keywords = {acidophytes, air, ammonia, bark ph, deposition, dispersion, impacts, lichens, netherlands, nitrophytes, oak trees, pollution, recolonization, spatial variability, woodland},
	author = {Wolseley, P. A. and James, P. W. and Theobald, M. R. and Sutton, M. A.}
}
@article {1704,
	title = {Bark pH and susceptibility to toxic air pollutants as independent causes of changes in epiphytic lichen composition in space and time},
	volume = {33},
	year = {2001},
	pages = {419-441},
	keywords = {agriculture, england, netherlands, pollution, quercus-petraea, vegetation},
	author = {van Herk, C. M.}
}
