@article {30013,
	title = {Field studies of photosynthesis in pine, spruce and aspen periodically subjected to SO2 and H2S from a nearby source. In : Proceedings of Alberta Sulphur Gas Research Workshop II, held at Environmental Sciences Centre, Kananaskis, Alberta, 16-17 January 1},
	year = {1975},
	pages = {106-121},
	institution = {Alberta Environment, Research Secretariat and University of Calgary, Environmental Sciences Centre},
	author = {Amundson, R. G. and Legge, A. H. and Walker, R. B.}
}
