@article {30806,
	title = {Ecological benchmarking and biomonitoring for detection of SO2 effects on vegetation and soils. In; S. S. Malhotra (ed.) The Effects of sulphur dioxide on forest vegetation and soils of Alberta oil sands. Annual Report (1976-1977) submitted to the Vegetat},
	year = {1977},
	pages = {24-47},
	author = {Addison, P. A. and Baker, J.}
}
