LAUBEK, Bjarke. Habitat use by Whooper Swans Cygnus cygnus and Bewick’s Swans Cygnus columbianus bewickii wintering in Denmark: increasing agricultural conflicts. Wildfowl, [S. l.], p. 8–15, 1995. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154673. Acesso em: 17 dec. 2025.