@article {1287,
	title = {Effects of ammonia, ammonium sulphate and sulphur dioxide on the frost sensitivity of Scots pine (Pinus sylvestris L.)},
	volume = {54 },
	year = {1990},
	pages = {35-49},
	author = {Dueck, T.A. and Dor{\`e}l, F.G. and Horst R.T. and Van der Eerden, L.J.M.}
}
