PENNYCOTT, T W. Causes of mortality in Mute Swans Cygnus olor in Scotland 1995-1996. Wildfowl, [S. l.], v. 50, p. 11–20, 1999. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154594. Acesso em: 15 apr. 2026.