@mastersthesis {29785,
	title = {Study of two remote sensing techniques for detection of sulphur dioxide stress in vegetation},
	volume = {Geography},
	year = {1974},
	pages = {170},
	address = {University of Western Ontario},
	keywords = {pollution, toxicity},
	url = {http://search.proquest.com/docview/302779973},
	author = {Thompson, M. D.}
}
