@article {491,
	title = {Establishing critical levels for the effects of air pollution on vegetation},
	volume = {85},
	year = {1995},
	pages = {189-200},
	author = {Ashmore, M.R. and Sanders, G.E. and Skarby, L. and Fuhrer, J.}
}
@article {754,
	title = {Establishing critical levels for the effects of air pollution on vegetation},
	volume = {85},
	year = {1995},
	pages = {189-200},
	author = {Sanders, G.E. and Skarby, L. and Ashmore, M.R. and Fuhrer, J.}
}
