@inbook {1692,
	title = {Atmospheric deposition of sulphur and nitrogen in heathland ecosystems.},
	booktitle = {Heathlands: Patterns and Processes in a Changing Environment.},
	number = {20},
	year = {1993},
	pages = {25-50},
	publisher = {Springer},
	organization = {Springer},
	chapter = {2},
	address = {Netherlands},
	author = {Bobbink, R. and Heil, G.W.}
}
