BOIKO, Dmitrijs; LUIGUJÕE, Leho. Distribution, abundance and habitat choice of Whooper Swans Cygnus cygnus breeding in Latvia and Estonia, 1973–2021. Wildfowl, [S. l.], p. 266–278, 2024. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/156363. Acesso em: 16 dec. 2025.