@article {559,
	title = {Influence of NH3 and (NH4)2SO4 on heathland vegetation},
	journal = {Acta Bot. Neerl},
	volume = {40},
	year = {1991},
	month = {281-297},
	author = {van der Eerdern, L.J. and Dueck, Th.A. and Berdowski, J.J.M. and Greven, H. and van Dobben, H.F.}
}
