@article {41635,
	title = {Current estimates of goose population sizes in western Europe, a gap analysis and an assessment of trends},
	journal = {Ornis Svecica},
	volume = {20},
	year = {2010},
	pages = {115{\textendash}127},
	url = {https://www.researchgate.net/profile/Petr_Musil/publication/265166369_Current_estimates_of_goose_population_sizes_in_the_Western_Europe_a_gap_analysis_and_assessment_of_trends/links/5402f4480cf23d9765a55fbf.pdf},
	author = {Fox, ANTHONY D and Ebbinge, Bart S and Mitchell, Carl and Heinicke, Thomas and Aarvak, Tomas and Colhoun, Kendrew and Clausen, Preben and Dereliev, Sergey and Farag{\'o}, Sandor and Koffijberg, Kees and others}
}
@article {Kampe-persson2010,
	title = {Naturalised geese in Europe},
	journal = {Ornis Svecica},
	volume = {20},
	number = {2008},
	year = {2010},
	pages = {155{\textendash}173},
	url = {http://www.jenskjeld.info/artikler/Kampe-Persson\_2010.pdf},
	author = {Kampe-persson, Hakon}
}
