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1by Roodbergen, Maja, van der Werf, Bert, Hoetker, HermannGet access
Published in Journal of Ornithology (2012)
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2by Leopold, Mardik F., van der Werf, Bert, Ries, Edith H., Reijnders, Peter J.H.Get access
Published in Biological Conservation (1997)
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Article in Journal/Newspaper