@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}
}
@article {Dolnik2007,
	title = {First finding of Tyzzeria parvula (Kotl{\'a}n, 1933) Klime{\v s}, 1963 (Protozoa: Coccidiida) in Barnacle Geese (Branta leucopsis Bechstein, 1803) on Spitsbergen},
	journal = {Zoosystematica Rossica},
	volume = {15},
	number = {January},
	year = {2006},
	pages = {214},
	url = {http://birdhealth.nl/literatuur/dolnik\_loonen.pdf},
	author = {Dolnik, OV and Loonen, M}
}
