van der Wal RJ, Zomerdijk PJ. The moulting of Tufted Duck and Pochard on the IJsselmeer in relation to moult concentrations in Europe. Wildfowl [Internet]. 1979 Jan. 1 [cited 2025 Dec. 18];:99-108. Available from: https://tidsskrift.dk/Wildfowl/article/view/154135