VAN DIJK, Klaas; VAN EERDEN, Mennobart R. Biometrics and timing of primary moult of non-breeding Mute Swans Cygnus olor at Lake IJsselmeer, the Netherlands. Wildfowl, [S. l.], p. 296–303, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154961. Acesso em: 17 dec. 2025.