NYGÃ¥RD, Torgeir; LARSEN, Bjorn Harald; FOLLESTAD, Arne; STRANN, Karl-Birger. Numbers and distribution of wintering waterfowl in Norway. Wildfowl, [S. l.], p. 164–176, 1988. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154720. Acesso em: 16 dec. 2025.