KURESOO, Andres. Present status of Mute Swans Cygnus olor, Whooper Swans C. cygnus and Bewick’s Swans C. bewickii in the Eastern Baltic Region. Wildfowl, [S. l.], p. 214–217, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154972. Acesso em: 17 dec. 2025.