OHTONEN, Arvo; HUHTALA, Kauko. Whooper Swan Cygnus cygnus egg production in different nesting habitats in Finland. Wildfowl, [S. l.], p. 256–259, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154962. Acesso em: 17 dec. 2025.