MATHIASSON, Sven. A moulting population of non-breeding Mute Swans with special reference to flight-feather moult, feeding ecology and habitat selection. Wildfowl, [S. l.], p. 43–53, 1973. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154883. Acesso em: 13 feb. 2026.