@article {Loonen2003,
	title = {Geese in the Wadden Sea: an effect of grazing on habitat preference},
	year = {2003},
	pages = {107{\textendash}120},
	keywords = {barnacle goose, brent goose, cattle, experiment, facilitation, intake rate, sheep},
	url = {http://www.maartenloonen.nl/literatuur/iwss-loonen.pdf},
	author = {Loonen, M and Bos, Daan}
}
