Keller, Verena
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2009: Wildfowl Special Issue No. 2 - Trends in numbers, distribution and movements
The Goosander Mergus merganser population breeding in the Alps and its connections to the rest of Europe
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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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2019: Wildfowl Special Issue No. 5 - Standard Papers
Whooper Swan Cygnus cygnus January population censuses for Northwest Mainland Europe, 1995–2015
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