@article {30721,
	title = {An overview - the effects of sulphur dioxide emission on the acidity and sulphur content of soils. In : Proceedings of Alberta Sulphur Gas Research Workshop III, Edmonton, Alberta, Nov. 17-18, 1977, edited by H. S. Sandhu and M. Nyborg},
	year = {1977},
	pages = {152-182},
	author = {Nyborg, Marvin and Walker, D. R.}
}
