@article {31644,
	title = {Stable sulphur isotope analysis of SO pollution impact on vegetation},
	volume = {36},
	year = {1978},
	pages = {221-230},
	publisher = {Oecologia},
	url = {http://www.springerlink.com/content/k4w54k8n3328770w/fulltext.pdf},
	author = {Winner, W. E. and Bewley, J. D. and Krouse, H. R. and Brown, H. M.}
}
