@article {813,
	title = {Influence of HN3 and (HN4)2 SO4 on heathland vegetation},
	volume = {40},
	year = {1991},
	pages = {281-296},
	author = {Van der Eerden, L.J.M. and Dueck, T.A. and Berdowski, J.J.M. and Greven, H. and van Dobben, H.F.}
}
