Brides, Kane, Kevin A. Wood, Richard D. Hearn, and Thijs P.M. Fijen. “Changes in the Sex Ratio of the Common Pochard Aythya Ferina in Europe and North Africa”. Wildfowl (November 28, 2017): 100–112. Accessed December 16, 2025. https://tidsskrift.dk/Wildfowl/article/view/154417.