@article {1641,
	title = {Relative performance of conifer populations in various tests for sensitivity to SO2 and the implications for selecting trees for planting in polluted areas.},
	journal = {New Phytologist},
	volume = {92},
	year = {1982},
	pages = {349-367},
	author = {Garsed, S.G. and Rutter, A.J.}
}
@article {1645,
	title = {Studies on the effects of low levels of sulphur dioxide on the growth of Lolium Perenne L.},
	journal = {New Phytologist},
	volume = {83},
	year = {1979},
	pages = {627-643},
	author = {Bell, J.N.B. and Rutter, A.J. and Relton, J.}
}
@article {570,
	title = {Sulphur dioxide and growth of Pinus sylvestris},
	journal = {Journal of Applied Ecology },
	volume = {14},
	year = {1977},
	pages = {861-875},
	author = {Farrar, J.F. and Relton, J. and Rutter, A.J.}
}
