@article {34411,
	title = {Tree-ring analysis by pixe for a historical record of soil chemistry response to acidic air-pollution},
	volume = {231},
	year = {1984},
	pages = {507-510},
	publisher = {Nuclear Instruments \& Methods in Physics Research},
	author = {Legge, A. H. and Kaufmann, H. C. and Winchester, J. W.}
}
