@article {256,
	title = {Effects of excessive ammonium deposition on the nutritional status and condition of pine needles},
	journal = {Physiologia Plantarum},
	volume = {73},
	year = {1988},
	pages = {494-501},
	author = {van Dijk, H.F.G. and Roelofs, J.G.M.}
}
