MJELSTAD, Hermund; SæTERSDAL, Magne. Reforming of resident Mallard pairs Anas platyrhynchos, rule rather than exception?. Wildfowl, [S. l.], p. 150–151, 1990. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154032. Acesso em: 13 feb. 2026.