@inbook {1546,
	title = {The effect of external stress and disturbance factors on Calluna dominated heathland vegetation.},
	booktitle = {Heathlands: Patterns and Processes in a Changing Environment. },
	year = {1993},
	pages = {85-124},
	publisher = {Kluwer Academic Publishers},
	organization = {Kluwer Academic Publishers},
	chapter = {The effect of external stress and disturbance factors on Calluna dominated heathland vegetation.},
	address = {Dordrecht},
	author = {Berdowski, J.J.M.}
}
