KEANE, Elizabeth M; O’HALLORAN, John. The behaviour of a wintering flock of Mute Swans Cygnus olor in southern Ireland. Wildfowl, [S. l.], p. 12–19, 1992. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/155368. Acesso em: 17 dec. 2025.