@article {1554,
	title = {Relationships between lichen community composition and concentrations of NO2 and NH3.},
	volume = {158},
	year = {2010},
	pages = {2553-2560},
	author = {Gadson, S.R. and Dagley, J.R. and Wolseley, P.A. and Power, S.A.}
}
