@article {1645,
	title = {Studies on the effects of low levels of sulphur dioxide on the growth of Lolium Perenne L.},
	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},
	volume = {14},
	year = {1977},
	pages = {861-875},
	author = {Farrar, J.F. and Relton, J. and Rutter, A.J.}
}
