Koffijberg, Kees
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Wildfowl 63 - Standard Papers
Does every goose count? Pitfalls of surveying breeding geese in urban areas
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2013: Wildfowl Special Issue No. 3 - Standard Papers
The Netherlands as a winter refuge for Light-bellied Brent Geese Branta bernicla hrota
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2013: Wildfowl Special Issue No. 3 - Standard Papers
Population development and breeding success of Dark-bellied Brent Geese Branta b. bernicla from 1991–2011
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2019: Wildfowl Special Issue No. 5 - Standard Papers
Long-term population trends and shifts in distribution of Bewick’s Swans Cygnus columbianus bewickii wintering in northwest Europe
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