@article {35435,
	title = {Evaluation of methods for determining adverse impacts of air pollution on terrestrial ecosystems},
	volume = {11},
	year = {1987},
	pages = {675-694},
	publisher = {Environmental Management},
	url = {http://www.springerlink.com/content/uw1h2v574m440481/fulltext.pdf},
	author = {Sigal, Lorene L. and Suter II, Glenn W.}
}
